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    Question

    Ravi invests Rs. 2,000 on simple interest at 'a%' p.a.

    for 4 years and earned an interest of Rs. 800. His friend Vinay invests Rs. 4,800 on simple interest at 30% p.a. for 'b' months and earned an interest of Rs. 3,600. Find the product of 'a' and 'b'.
    A 320 Correct Answer Incorrect Answer
    B 250 Correct Answer Incorrect Answer
    C 300 Correct Answer Incorrect Answer
    D 165 Correct Answer Incorrect Answer

    Solution

    Simple interest = (Principal ├Ч rate ├Ч time) ├╖ 100 ATQ, 800 = 2,000 ├Ч a ├Ч 4 ├╖ 100 Or, 800 = 80a So, 'a' = 10 And, 3,600 = (4,800 ├Ч 30 ├Ч b) ├╖ (12 ├Ч 100) ...... (since, time is in months) Or, 3,600 = 120b Or, 'b' = 30 Therefore, the required product = (a ├Ч b) = 10 ├Ч 30 = 300

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