Simple Interest on certain sum of money of 10 year is 3130 but if after 5 year principal become 5 times then find the total SI after 10 years.

Question: Simple Interest on certain sum of money of 10 year is 3130 but if after 5 year principal become 5 times then find the total SI after 10 years.

Solution:
SI of 10 years = 3130
Simple Interest same in every year.
So, SI in first 5 year = (3130/10) × 5 = 1565

If principal become 5 times in 5 year than interest will also become 5 times.
So, Interest of next 5 years= 1565 × 5 = 7825
Total Simple Interest = 7825 + 1565 = 9390