book Maths Puzzle Numerical Ability

Ted Burton invested his savings in 50 shares of stock. In 3 days, the stock gained 3 1/8 points, lost 3/4 of a point, and gained another 1/8 of a point. What was the net gain of th

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can you please help me with this problem..
32-5c-2(c-1)=-50 The value for imports for a small Central American country is believed to be growing according to the function

I=15 log(16t+33)

and the value of exports appears to be growing