Thomas buys a weight vest. It weighed 60 pounds and worked well for him in the beginning but after a bit of training he decides he wants to increase the weight by 60%. The weights come in 2-pound steel ingots. Each ingot cost $5 and if you buy more than 10 you get a 20% discount. How much does it cost to get the weight he needs? Let's be accurate as possible.
He needs to buy 60 * .6 = 36 pounds. So he needs to buy 36 / 2 = 18 weight plates. That would cost 18 * 5 = $90. Since he bought more than 10 he gets a discount so he gets 90 * .2 = $18 off. That means he paid 90 - 18 = $72.
The answer: 72.