Lizzy: Mark hires a singer for 3 hours at $15 an hour. He then tips the singer 20%. How much did he pay?.
Me: Hmmm, let me think. I think this is the detailed solution:
User
The cost was 15 * 3 = $45. So the tip was 45 * .2 = $9. So in total, he paid 45 + 9 = $54. Final answer: 54.
Assistant