Table $1-3$

Extra Hours Open Total Revenue $($dollars$)$

$1$ $$70$

$2120$

$3160$

$4184$

$5200$

$6210$

Santiago runs a comic book store in the town of East Arbor. He is debating whether he should extend his hours of operation. Santiago figures that his sales revenue will depend on the number of extra hours the store is open as shown in the table above. He would have to hire a worker for those extra hours at a wage rate of $$18$ per hour.

Refer to Table $1-3.$ What is Santiago's marginal benefit if he decides to stay open for an extra two hours instead of one hour?

$$40$

$$50$

$$120$

$$190$