These questions are from millions of online tutorials and YouTube websites. I don’t know if I am allowed to ask experts to explain those questions in a different way. They are not homework assignments. I am trying to develop my own web site. Math’s has many ways to solve the problems. Just want to understand them.
1. In part B according to my calculation, 20% of 84 is 16.8 and then subtract 16.8 from 84 to get the whole sale price which is 67.2 but the correct answer is $70.