[bcsco]

Once you've gotten the $7.50, two of the three wrong answers can easily be eliminated: 50 dimes is $5 and 90 pennies is $0.90. Dividing the 30 quarters by 2 and then by 2 again would quickly confirm that one as the correct answer.

I went the route

1 Euro = $1.50

5 Euros = $7.50

1 Quarter = $0.25

$7.50/0.25 = 30

Answer = A

[cripplecreek]

I went from 2 euros is 3 bucks to 4 euros is 6 bucks. Add another 1.50 to get 7.50 and screw the change that goes in a jar.