Taxi And Fare

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Problem Description - The taxi fare in a city is as follows : For the first X kilometre, the fares is M and for the subsequent distance it is N per kilometre. You are given total distance covered by taxi. Find out total fare. Constrains 10Input First line of program will contain number of test case Each test case contains four space separated Integer X,M,N,D Output For each test case print

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solution.cppC++17

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