NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 7: Comparing Quantities - Problems and Solutions
Question 132

Question. 132

₹ 9000 becomes ₹ 18000 at simple interest in 8 years. Find the rate of interest per annum.

Answer:

Rate = 12.5%

Detailed Answer with Explanation:

SI = 18000 − 9000 = 9000.
Using SI = (P × R × T)/100 ⇒ 9000 = (9000 × R × 8)/100.
R = (9000 × 100)/(9000 × 8) = 12.5%.

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NCERT Exemplar Solutions Class 7 – Mathematics – Unit 7: Comparing Quantities – Problems and Solutions | Detailed Answers