Building off of the Gold Standard and Gold/Silver Standard problems, let's make a weighted currency convertor. The same data for gold value and silver-to-gold ratio will be provided in the function template.
For this problem, based on a historical year (HY) and a historical value (HV) in dollars, calculate the current value using the gold (CVG) and silver (CVS) references; see the referenced problems for details and examples of those individual problems. In this case, you will be provided a weighting that will range from 0 to 1, where 0 indicates complete weighting by gold and 1 indicates complete weighting by silver. Remember to round the result to two decimal places. If HY is outside of the historical data range, return NaN.
As an example, with HY = 2000, HV = 1000, and wt = 0.4: