Debit Cards The following two functions have a common input, year y: D gives the total number of debit-card transactions, and P gives the number of point-of-sale debitcard transactions.
a. Using function notation, show how to combine the two functions to create a third function, r, that gives the percentage of debit card transactions that were conducted at the point of sale in year y.
b. What are the output units of the new function?
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