Correct Answer - Option 5 : 8000

**GIVEN:**

For the first 2 years, r = 4% per annum, t = 2 years

next 4 years, r = 6% per annum, t = 4 years

next 3 years, r = 8% per annum, t = 3 years

**FORMULAE USED:**

SI = (p × r × t)/100

**CALCULATION:**

the simple interest for the first 2 years = (p × 4 × 2)/100 = 2p/25

the simple interest for the next 4 years = (p × 6 × 4)/100 = 6p/25

And then, for the

the simple interest for the next 3 years = (p × 8 × 3)/100 = 6p/25

⇒ Total interest = (2p/25) + (6p/25) + (6p/25) = 14p/25

So, 14p/25 = 4480

⇒ p = Rs. 8000

Hence, the principal amount is Rs. 8000