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Option 1 : 50%
⇒ Future value of the installment = 7500
⇒ Present value of the installment = 15000 – 7800 = 7200
⇒ Interest charged for the installment = future value – present value = 7500 – 7200 = Rs. 300
We know,
⇒ Interest = PRT/100
Here, P= 7200 and T = 1/12
⇒ 300 = (7200 × R) / (100 × 12)
⇒ 6R = 300
⇒ R = 50
∴ Rate of interest for the installment plan is 50%
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