TCS Company Numerical Ability Age Problem

the price of a maruti car rises by 30% while the sales of the car came down by 20%. what is the percent change in the total revenue?
(a)-4(b)4(c)-2(d)0(e)none of these

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TCS Other Question

a two digit num "ab" is six times the sum of its digits.find the value of b^a. A,B,C are the mechanisms used seperately to reduce the wastage of fuel by 30%,40%,10%.What will be the fuel economy?