Marco makes $65,000 a year as a graphic designer. he makes a charitable donation of $1,000 each year. he also has $5,000 of business-related expenses, including travel and materials.

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)