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
B 250
C 300
D 165
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