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Answer:
10.94%
Explanation:
Your father was born 48 years ago
His grandfather deposited $250 in an account for him
Today the money is worth $36,500
The annual rate of his return can be calculated as follows
= 36500/250 ×1/48= (1+r/100)
= 146^0.020833= (1+r/100)
= 1.1094-1
= 0.10940×100
= 10.94%