How are the power rules for quotients and products similar? how are they different?

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Find the solution on the interval [0, 2pi)