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

### Instruction:
Gary has 30 grams of gold that cost $15 per gram. Anna has 50 grams of gold for the cost of $20 per gram. How much is the cost of their gold combined?

### Response:
 Kununua kiasi sawa cha dhahabu kama ya Gary, mtu anapaswa kulipa 30 * 15 = $<<30*15=450>>450.
Kununua kiasi sawa cha dhahabu kama ya Anna, mtu anapaswa kulipa 50 * 20 = $<<50*20=1000>>1000.
Hivyo, jumla, dhahabu yao itagharimu 450 + 1000 = $<<450+1000=1450>>1450.