Let the cost of an apple be A and the cost of a pear P.
Mrs Lin spent 12P+4A.
Perhaps Mrs Wang spent 4P+12A because she bought 4 pears and 12 apples?
Mrs Lin spent $1.60 more than Mrs Wang, so:
12P+4A=4P+12A+1.60,
8P=8A+1.60. If A=$0.35, then:
8P=8×0.35+1.60=2.80+1.60=$4.40,
P=4.40/8=$0.55, or 55 cents. A pear costs 55 cents.