how to fix the error?

Write a function called fare that computes the bus fare one must pay in a given city based on the distance travelled. Here is how the fare is calculated: the first mile is $2. Each additional mile up to a total trip distance of 10 miles is 25 cents. Each additional mile over 10 miles is 10 cents. Miles are rounded to the nearest integer other than the first mile which must be paid in full once a journey begins. Children 18 or younger and seniors 60 or older get a 20% discount. The inputs to the function are the distance of the journey and the age of the passenger in this order And here is the code

when I checked the grader is telling the problem is incorrect that means some error is there in the code which I am not getting.it will be helpful if anyone help me to get rid of the error.

 if D<=1&&D>0 
      if A<=18 || A>=60
      f=2;
      dol = f*80/100;
      fprintf('fare for the first mile is $2 with concession\n');
      else
      dol=2;
      fprintf('fare for the first mile is $2 without concession\n');
      end
  elseif D>1
      if D<=10&&(A<=18||A>=60)
       dol = (2+(D-1)*0.25)*80/100;
      fprintf('fare with concession for each additional mile upto total dist of 10 miles is 25 cents with concession\n');
      else   
      dol = 2+(D-1)*0.25;
      fprintf('fare without concession for each additional mile upto total dist of 10 miles is 25 cents with concession\n');
      end
  elseif D>10&&(A<=18||A>=60)
      x=D-11;
      dol=(2+10*0.25+x*0.10)*80/100;
      fprintf('fare with concession for each additional mile above 10 miles is 10 cents with concession\n');
     else
      x=D-11;
      dol=2+(10*0.25)+(x*0.10);
          fprintf('fare without concession for each additional mile above 10 miles is 10 cents with concession\n');
  end
  end

[Stephen23]

@Asha Sunilkumar: today I formatted your code for you. In future you can do it yourself: select the code text, click the {} code button, and ensure that there is an empty trailing line.

[John D'Errico]

How can we guess what the correct result is for those cases? All that we see is your code, and it is apparently incorrect.

[Asha Sunilkumar]

when D=1 and A=11 the case is first one so answer i am getting is 0.4. i hope that is correct.

[John D'Errico]

READ MY ANSWER. It explains why a 20% reduction in fare is NOT the same thing as an 80% reduction in fare.

Answer 1

[John D'Errico]

Why do you think that 0.4 is correct?

The first mile is $2.00. If age is less than or equal to 18 (or at least 60), then the fare is reduced by 20%, so 80% of $2.00 is what you should return. (Thus 1.60, NOT 0.40.)

So what does your code do when D==1?

dol = 2*D*20/100;

So you are taking 20% of 2*D. WHY? That result is never indicated by the problem you were posed.

What were you told? When D <= 1, the fare is $2.00. That is true, UNLESS age is less than 18 or greater than or equal to 60.

So your tests might start like this:

if D <= 1
  fare = 2;
  if A <= 18 || A >= 60
    fare = fare*(1-20/100);
  end

elseif ...

There are of course similar problems with the remainder of your code, because it looks like you did not appreciate what a 20% REDUCTION in fare means.

Suppose you were told that item X (which normally costs $!.00) is on sale in the store for a 20% reduction in price? You would expect to pay $0.80. You would NOT expect to pay 20 cents. Well, you should not. And the clerk in the store would not let you get away with paying that price either.

[Asha Sunilkumar]

ohh its true. It's my fault. sorry. but still it is showing error.

[John D'Errico]

Fix ALL of the cases where you did the same thing. As well, I suppose you want to use the variable dol, instead of fare as I did.

But to tell us that it is still showing an error, this tells us nothing, because you don't tell us what the error is.

[Asha Sunilkumar]

I am getting a comment as 'program made an error for 1.45,17 'I couldn't figure it out.I fixed all the cases where I made error of 20%. re edited program is posted