Answer: APR = 7.8%
Step-by-step explanation:
Initial money in account = $72000
After 5yrs it becomes $100,000
Interest in 5yrs = $100,000 - $72,000
= $28,000
Interest per year = $28,000/5 = $5600
APR = 5600/72000 x 100%
= 0.078 x100% = 7.8%
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