How would I figure out this math question?

Question

The probability that a homeowner needs a plumber this year is 22%. The probability that the homeowner needs a septic tank specialist is 14%. Estimate the probability that the homeowner needs a plumber, but not a septic tank specialist.     

Answer 1

you might want to do a Venn diagram

P(p) = .22

P(s) = .14

P(p^~s) = P(p) - P(p^s) = .22 - (.22)(.14) = .22 -.0308

= .21.9692

= about 21.97%