math question need help pls

Question

A phone company offers two monthly plans. Plan A costs $27 plus an additional %0.12 for each minute of calls. Plan B costs $20 plus an additional $0.14 for each minute of calls. For what amount of calling do the two plans cost the same?

For what amount of calling do the two plans cost the same?

Answer 1

27+.12m = 20+.14m

.02m = 7

m = 7/.02 = 700/2 = 350 minutes means same cost for A or B