Mick paid $2.94 in sales tax on an item that cost $42.00 before tax. at that rate, how much would he pay in slaes tax for an item that costs $58.00 before tax?

To find the inverse of a number a, one can use the equation f(c) = a-1/c=0 where c is the inverse of a use the secant method of finding roots of equations to find the inverse of a = 2.5 ,er = 0.001%