Ala just finished a great meal at a restaurant in wisconsin. the sales tax in wisconsin is 5%, percent, and it is customary to leave a tip of 15%, percent for the server. the tip amount is calculated on the price of the meal before the tax is applied. (sales tax is not calculated on tips.)
if ala ordered a $15 meal, how much money will he have to pay with tax and tip?

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?