Invoice: $1,000 terms: 3/10, n/30 invoice date: may 5 payment amount: $800 date paid: may 9
a. $265.26; $624.74
b. $724.74; $275.26
c. $176.00; $824.00
d. $824.74; $175.26

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?