Harriet spent $4050 on other supplies for her aviary.She spent $326 less on litter than she did on perches,and twice as much on nesting boxes as litter and perches combined. How much did she spend on perches?
L + P + N = 4050
L = P - 326
2 (L + P) = N
L + P + 2L + 2P = 4050
L + P = 1350
(P - 326) + P = 1350
2 P = 1676