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

### Instruction:
Ursula went to the store and bought butter, bread, a package of cheese, and tea. The bread was 2 times cheaper than the butter, while the price of the butter was 80% of the price of cheese. Tea was the most expensive and cost twice the price of a package of cheese. If the tea cost $10, how much did Ursula pay for her purchases?

### Response:
 Bei ya chai ilikuwa mara mbili ya bei ya jibini, hivyo bei ya jibini ilikuwa $10 / 2 = $<<10/2=5>>5.
Bei ya siagi ilikuwa 80/100 * 5 = $<<80/100*5=4>>4.
Ikiwa mkate ulikuwa mara mbili bei ya siagi, basi uligharimu 4 / 2 = $<<4/2=2>>2.
Hivyo, kwa manunuzi yake yote, Ursula alilipa 2 + 4 + 5 + 10 = $<<2+4+5+10=21>>21.