In certain parts of new york drivers must pay a fee to drive over bridges. the department of transportation issues to payment options from which drivers can choose. plan one requires drivers to pay a monthly fee of $15 plus $.25 each time they cross over a bridge. plan two has no monthly fee but drivers must pay $1.50 each time they cross over a bridge. at how many bridge crossings does the price of plan one equals the price of plan two?
a.10
b.12
c.13
d.18