You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[EX Q]: Before December , customers buy 1346 ear muffs from the mall . During December , they buy 6444 , and there are none . In all , how many ear muffs do the customers buy ?
[EX A]: 7790

[EX Q]: A florist had 50 roses . If she sold 15 of them and then later picked 21 more , how many roses would she have ?
[EX A]: 56

[EX Q]: A furniture store marks up items 20 % . It the furniture store buys a couch for 350 dollars , what will the selling price be , in dollars ?
[EX A]:
420