Question
A person 'P' invested Rs. 800 for
2 years at an interest rate of 'a'% per annum, Rs. 450 for 4 years at an interest rate of (a - 2)% per annum, and Rs. 1200 for 5 years at an interest rate of 5% per annum. The total simple interest earned was Rs. 604. Determine the value of 'a'.Solution
ATQ, 800 × 2 × a% + 450 × 4 × (a - 2)% + 1200 × 5 × 5% = 604 16a + 18a – 36 + 300 = 604 34a + 264 = 604 34a = 340 a = 10
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