instead of multiplying a number by 7 , the number is divided by 7 . what is the percentage of error obtained ?
"let the number be x the right number is 7 x the wrong number is x / 7 error is ( 7 x - x / 7 ) = 48 x / 7 percentage of error is ( ( 48 x / 7 ) / 7 x ) * 100 = 97.959 % answer : a"
subtract(const_100, multiply(divide(divide(7, 7), multiply(7, 7)), const_100))