George wants to buy a $200 bike by the end of the summer. he decides to do odd jobs to earn money for the bike. he mows lawns, washes cars, and waxes cars. his rates are $10 for a mowed lawn, $8 for a washed car, and $4 for a waxed car. by the end of june george has mowed 10 lawns, washed 8 cars, and waxed 6 cars.
how much more money does he need to buy the bike ?