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

### Instruction:
Sam bought a heavy safe with a combination lock. There were four rows with twenty gold bars per row arranged in the safe. If each gold bar is worth $20000, calculate the total worth of the gold bars in the safe.

### Response:
 Ikiwa kulikuwa na safu nne za dhahabu ishirini zilizopangwa kwenye sefu, idadi jumla ya dhahabu kwenye sefu ni 4*20 = <<4*20=80>>80 dhahabu.
Kwa kuwa kila dhahabu ina thamani ya $20000, dhahabu 80 ina thamani ya 80*$20000 = $1600000