Let's assume
total number of cards =x
Pristine printing business cards:
for $0.10 each plus a setup charge of $15
so, we get equation for cost as

Printing Place business cards:
for $0.15 each with a setup charge of $10
so, we get equation for cost as

now, we are given
cost from both companies are same
so, we can set costs equal

now, we can solve for x



so,
number of business cards is 100.........Answer