Lou Ann spends 50 usd per month for a bus and subway pass. She estimates that if she bought a car, she would spend 105 usd per month on car payments, 70 usd per month for parking, 80 usd per month for gasoline and upkeep, and 75 usd per month for insurance. About how much does she save per month by using public transportation?

Explanation

First, add to find how much her monthly expenses would be if she used a car.
\(\$ 105+\$ 70+\$ 80+\$ 75=\$ 330\)
Subtract $50 (cost of bus and subway pass) to find how much she saves per month by using public transportation.

\(\$330 – \$50 = \$280\)

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