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

### Instruction:
Miss Grayson's class raised $50 for their field trip. Aside from that, each of her students contributed $5 each. There are 20 students in her class, and the cost of the trip is $7 for each student. After all the field trip costs were paid, how much is left in Miss Grayson's class fund?

### Response:
 Darasa la Miss Grayson liliweza kukusanya jumla ya $50 + $5/mwanafunzi x wanafunzi 20 = $150.
Gharama ya safari ni $7 x wanafunzi 20 = $<<7*20=140>>140.
Hivyo, darasa la Miss Grayson limebaki na $150 - $140 = $<<150-140=10>>10.