Correct Answer - Option 4 : Rs. 5,700
Given:
Raman borrowed Rs. 30,000 at 25% p.a simple interest
Lend to Raghav at 40% p.a compounded half yearly
Formula used:
S.I = (PRT)/100
C.I = P{(1 + R/100)n - 1}
Gain= Interest paid by Raman - Interest receive by Raman/Paid by Raghav
Calculation:
40% p.a compounded half yearly
⇒ Rate for 6 months is 20%
By using the formula of S.I
Total interest paid by Raman = (PRT)/100
⇒ (30,000 × 25 × 1)/100 = 7,500
Total interest received by Raman/Paid by Raghav = P{(1 + R/100)n - 1}
⇒ 30,000{(1 + 20/100)2 - 1}
⇒ 30,000{(120/100)2 - 1}
⇒ 30,000{(144/100) -1}
⇒ 300(144 - 100)
⇒ 300 × 44
⇒ 13,200
According to the formula
Gain = 13,200 - 7,500 = 5,700
∴ Gain of Raman after one year is 5,700.