A certain store sells all maps

[serGINho]

A certain store sells all maps at one price and all
books at another price. On Monday the store sold 12 maps and 10 books for a total of $38.00, and on Tuesday the store sold 20 maps and 15 books for a total of $60.00. At this store, how much less does a map sell for than a book?

(A) $0.25
(B) $0.50
(C) $0.75
(D) $1.00
(E) $1.25

[crazy800]

IMO B

12M + 10B = 38
20M + 15B = 60

solve it and get the ans

[Baten80]

Ans. 0.50

[MBAchase]

maps=m
books=b
12m+10b=38
20m+15b=60
or
6m+5b=19
4m+3b=12-->m=(12-3b)/4
plugging into the first eq
{6*(12-3b)/4}+5b=19
(36-9b)/2 +5b=19
b=2
and m=3/2
answer is $0.50