Answer:
$15
Step-by-step explanation:
In order to calculate the purchasing power lost the following formulae will be used:
Purchasing power lost = Loaned amount * (inflation rate - nominal rate)
Purchasing power lost = $500 * (0.07 - 0.04)
Purchasing power lost = $500 * 0.03
Purchasing power lost = $15
Hence, the purchasing power lost after Richard repays the loan in full is $15.