A contractor planning the construction of a house found he would have to pay:
$1,100 to the paper hanger and the painter,
$1,700 to the painter and plumber,
$1,100 to the plumber and electrician,
$3,300 to the electrician and carpenter,
$5,300 to the carpenter and mason,
$3,200 to the mason and painter.
Who charges the largest amount for his work?
Source: More Mathematical Puzzles of Sam Loyd, Volume 2 by Martin Gardner, 1960