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

### Instruction:
Joseph has a refrigerator, a water heater in his house, and an electric oven that consumes power at different rates. The total amount of money that Joseph pays for the energy used by the refrigerator is three times the amount he pays for the power used by the water heater. If the electric oven uses power worth $500 in a month, twice what Joseph pays for the power the water heater uses, calculate the total amount he pays for the power used by these gadgets.

### Response:
If the electric oven uses power worth $500 in a month, twice what Joseph pays for the power the water heater uses, the water heater uses power worth 1/2*$500=$<<500/2=250>>250
The total amount of money that Joseph pays for the power used by the water heater and the electric oven is $250+$500 = $<<250+500=750>>750
The total amount of money that Joseph pays for the power used by the refrigerator is three times the amount he pays for the power used by the water heater, a total of 3*$250 = $<<3*250=750>>750
For the three gadgets, Joseph pays $750+$750 = $<<750+750=1500>>1500 for the power they use.
#### 1500