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# Radhika borrowed ₹12000 from her friends. Out of which ₹4000 were borrowed at 18% and the remaining at 15% rate of interest per annum. What is the total interest after 3 years

**Solution:**

Given, Radhika borrowed ₹12000 from her friends.

?4000 were borrowed at 18% and remaining at 15% rate of interest per annum.

We have to find the total interest after 3 years.

We know, Interest I = P × R × T/100

According to the question,

P1 = ₹4000

R1 = 18%

T = 3 years

I1 = 4000 × 18 × 3/100

= 40 × 18 × 3

= 120 × 18

I1 = ?2160

P2 = ?12000 - ?4000 = ?8000

R2 = 15%

T = 3 years

I2 = 8000 × 15 × 3/100

= 80 × 15 × 3

= 250 × 15

I2 = ₹3600

Total interest = I1 + I2

= 2160 + 3600

= 5760

Therefore, the total interest is ₹5760.

**✦ Try This: **The weight of a box is 30 kg. In a hurry, it was weighed as 30.6 kg. Find the error percentage.

**☛ Also Check: **NCERT Solutions for Class 7 Maths Chapter 8

**NCERT Exemplar Class 7 Maths Chapter 7 Problem 107**

## Radhika borrowed ₹12000 from her friends. Out of which ₹4000 were borrowed at 18% and the remaining at 15% rate of interest per annum. What is the total interest after 3 years

**Summary:**

Radhika borrowed ₹12000 from her friends. Out of which ₹4000 were borrowed at 18% and the remaining at 15% rate of interest per annum. The total interest after 3 years is ₹5760.

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