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

### Instruction:
A fast-food chain offers free delivery for a minimum purchase of $18. Danny ordered 2 quarter-pounder burgers for $3.20 each, 2 large fries that cost $1.90 each, and 2 milkshakes that cost $2.40 each. How much more worth of food should he order to avail of the free delivery?

### Response:
 Jumla ya chakula Danny alinunua ni $3.20 + $3.20 + $1.90 + $1.90 + $2.40 + $2.40 = $<<3.2+3.2+1.9+1.9+2.4+2.4=14.6>>14.6
Usafirishaji wa bure unatolewa wakati jumla ya chakula kilichonunuliwa ni $18 au zaidi.
Hivyo, Danny anahitaji kununua chakula cha thamani ya $18 - $14.60 = $<<18-14.6=3.4>>3.4 zaidi ili apate usafirishaji wa chakula bure.