at a florist shop on a certain day , all corsages sold for either $ 40 or $ 45 . if 8 of the corsages that sold for $ 30 had instead sold for $ 20 , then the store ' s revenue from corsages that day would have been reduced by 20 percent . what was the store ' s actual revenue from corsages that day ?
"i am doing it elaborately , hope it will help you . let , no . of corsages @ $ 40 = x , no . of corsages @ $ 45 = y and revenue = r so , 40 x + 45 y = r . . . . . . . . . ( 1 ) now , given the situation , 40 ( x + 8 ) + 45 ( y - 8 ) = r - . 2 r = > 40 x + 320 + 45 y - 360 = . 8 r = > 40 x + 45 y = . 8 r + 40 . . . . . . . . . . . . ( 2 ) so , r = . 8 r + 40 = > r = 200 the answer is a ."
subtract(divide(negate(subtract(multiply(40, 8), multiply(45, 8))), divide(20, const_100)), subtract(multiply(40, 8), multiply(45, 8)))