NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 7: Comparing Quantities - Problems and SolutionsQuestion 132
Class 7 - Mathematics - Unit 7: Comparing Quantities - Problems and Solutions
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%.