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

### Instruction:
Harry's birthday was three weeks after the closing of the school. His three friends decided to contribute an equal amount of money to throw him a party. Harry added $30 to the contribution, making the total contribution three times as much as Harry contributed. Calculate the total amount of money that each of Harry's friends contributed.

### Response:
 Hebu tuchukue kiasi ambacho kila rafiki wa Harry alitoa kuwa $x. Kwa hiyo, Harry alitoa $30.
Jumla ya pesa ni $30 + 3x.
Jumla ya pesa ni mara tatu ya mchango wa Harry.
Hivyo, $30 + 3x = 3($30) = $90.
Kwa kusuluhisha x, $x = $<<90-30=60>>60.
Hivyo, kila rafiki wa Harry alitoa $60.