Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Every hour Joanne has to collect the coins out of the fountain inside the mall. During the first hour, she collected 15 coins. For the next two hours, she collected 35 coins from the fountain. In the fourth hour, she collected 50 coins from the fountain but she gave 15 of them to her coworker so she could buy a soda. How many coins did she have after the fourth hour?

### Response:
 Sarafu 15 zilikusanywa katika saa ya kwanza
Sarafu 35 zilikusanywa katika saa ya pili
Sarafu 35 zilikusanywa katika saa ya tatu
Sarafu 50 zilikusanywa katika saa ya nne
Kabla ya kumpa rafiki yake baadhi ya sarafu kulikuwa na jumla ya sarafu 15+35+35+50=<<15+35+35+50=135>>135
Idadi ya sarafu baada ya kumpa rafiki yake 15 ni 135-15=<<135-15=120>>120