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

### Instruction:
 Mark constructed a deck that was 30 feet by 40 feet. It cost $3 per square foot. He then paid an extra $1 per square foot for sealant. How much did he pay?


### Response:
 Das Deck ist 30 Fuß mal 40 Fuß groß = 1200 Quadratfuß.
Das Deck kostet also 3 * 1200 = 3600 Dollar.
Er zahlte zusätzlich 1 * 1200 = 1200 Dollar für die Versiegelung.
Insgesamt hat er also 3600 + 1200 = 4800 Dollar bezahlt.