i wanted to shout out mathmate for helping me with a hard problem thanks math mate makesure you thank him at

Percent increase and decrease. original number: 45 new number: 18

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! )

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters