The employees from maintenance go for coffee together every day
at 9 am. on monday, hector paid $5.45 for three cartons of milk,
four cups of coffee and seven doughnuts. on tuesday, guillermo
paid $5.30 for four milks, two coffees, and eight doughnuts. on
wednesday, anna paid $5.15 for two milks, five coffees, and six
doughnuts. on thursday, alphonse had to pay for five milks, two
coffees, and nine doughnuts. how much change did he get back
from his $10 bill?