Marbles come in two sizes: 1-inch diameter and 2-inch diameter. The 1-inch diameter marbles cost 30 cents less than the 2-inch marbles. Rochelle buys 25 1-inch marbles for her science project and spends exactly $10. Find the cost of a 2-inch marble. (1 point)
Let x be the cost of a 2-inch marble.
The cost of a 1-inch marble is x-30 cents.
30*25 cents = $7.5
$0.3*(x-30)=7.5
x-30=25
x=<<30+25=55>>55 cents. Answer: \boxed{55}.