exam Maths Puzzle Numerical Ability

Please assist me with the following question....thank you
Nancy Tai has recently opened a revolving charge account with MasterCard. Her credit limit is $1000, but she has not char

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A function f(n) defined for all positive integers has the property that f(m)+ f(n) = f(mn) for any two positive integers m and n. If f(2) = 7 and f(3) = 10, then calculate f(12). Suppose $500 is invested at 6% annual inerest compounded twice a year. When will the investment be worth $1000?