Question

a pair of hiking boots originally cost $100.the price was increased by 10%, then decreased 10%. what was the price after these changes?

Answer 1

`p\%=(p)/(100)\\\\10\%=(10)/(100)=0.1\\\\10\%\ of\ \$100=0.1\cdot\$100=\$10\\\\The\ price\ after\ increase:\$100+\$10=\$110\\\\10\%\ of\ \$110=0.1\cdot\$110=\$11\\\\The\ price\ after\ decrease:\$110-\$11=\$99\\\\Answer:\\\underline{The\ price\ after\ these\ changes\ is\ equal\ \$99}`