Question
A sum of ₹7,500 amounts to ₹11,700 in 8 years at a
certain rate of simple interest. Find the rate of interest per annum.Solution
P =7500, A =11700, T=8y SI=A-P=11700-7500 SI=4200, R=? 
= (4200×100)/7500×8 =21/3 =7% R=7%.
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