The number of cans of paint you can buy next year is 11 cans.
To determine the number of cans you can buy next year, the nominal interest rate is used to determine the future value of the $100 saved. Similarly, the expected inflation rate is used to determine the cost of a can of paint next year.
Amount to be spent on paint today = $100
Cost of a can of paint today = $10
Nominal interest rate = 21%
Expected inflation rate = 10%
Period of savings = 1 year
Future value of $100 in a year's time = $121 ($100 x 1.21)
Expected cost of a can of paint in a year's time = $11 ($10 x 1.1)
Number of cans to buy next year = 11 cans ($121/$11).
Thus, the number of cans of paint you can buy next year is 11 cans instead of 10 cans today.
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