Question 424290
Cost of style 1 = 25 + 0.02x
Cost of style 2 = 10 + 0.05x
We need to set these two costs equal:
25 + 0.02x = 10 + 0.05x
Solving for x gives 0.03x = 15 -> x = 500
So the answer is 500 cards.
Check: 25 + 0.02*500 = 35
       10 + 0.05*500 = 35