Sal and two of his friends rent an apartment together. Their total cost to move in included first month's rent, last month's rent and a security deposit of $1,200. If Sal paid a total of $1,000 to move in, how much is his share of the rent each month?

The $1,200 security deposit is split among three roommates, so Sal’s share is $400. The remaining $600 of his $1,000 move-in payment covers first and last month’s rent, or two months of his rent share. Divide $600 by 2 to get $300 per month, so the correct choice is $300.

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