Correct Answer - Option 2 : Rs. 1,71,417.6

**Given: **

Principal = Rs. 2,88,000

Rate for 1^{st} case = 6 %

Time for 1^{st} case = 4 years

Rate for 2^{nd} case = 8%

Time for 2^{nd} case = 6 years

**Formula used: **

Simple interest = Principal × Rate/100 × Time

**Calculation: **

Interest for 1^{st} 4 years,

Simple interest = Principal × Rate/100 × Time

⇒ Simple interest = 288000 × 6/100 × 4

⇒ Simple interest = Rs. 69,120

Interest for next 6 years,

New principal = 288000 + 69120 = Rs. 3,57,120

Simple interest = Principal × Rate/100 × Time

⇒ Simple interest = 357120 × 8/100 × 6

⇒ Simple interest = Rs. 1,71,417.6

**∴**** The interest earned by the Mr. Amar at the end of last 6 years is Rs. 1,71,417.6 **