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A man borrowed ₹1000 for 3 yrs and ₹1500 for 4 yrs at same simple interest rate. Total interest = ₹1350. Find rate.
Question

A man borrowed ₹1000 for 3 yrs and ₹1500 for 4 yrs at same simple interest rate. Total interest = ₹1350. Find rate.

A.

8%

B.

15%

C.

10%

D.

12%

Correct option is B

Given:

Loans: 1000 for 3 yrs, 1500 for 4 yrs

Total SI = 1350
Formula:

SI = (P × R × T) / 100
Solution:

Interest for first loan = 1000 × R × 3 ÷ 100 = 30R

Interest for second = 1500 × R × 4 ÷ 100 = 60R

Total = 90R = 1350 R = 1350 ÷ 90 = 15%

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