6.
7. At what rate of interest per annum would be 6500 amount to 8612.50 in 5 years?
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Answer:8.5%
Step-by-step explanation:
Let the rate of interest be x%.
P=₹6500
SI=₹8612.50 - ₹6500
=₹2112.50
R=x%
T=5 years
SI=PRT/100
₹2112.50 = ₹6500 × x × 5/100
2112.50 = 65 × 5 × x
211250/100 = 65 × 5 × x
211250/100 × 65 × 5 =x
3250/100 × 5=x
3250/500 =x
x = 8.5℅
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