Question: Solve the math problem: Tim gets a promotion that offers him a 5% raise on his $20000 a month salary.  It also gives him a bonus worth half a month's salary. How much money will he make in a year?
Answer: 
The promotion increased his monthly salary by 20000*.05=$1000
So his new salary is 20000+1000=$21000 a month
So he makes 21000*12=$252,000 a year
The bonus is worth 21000*.5=$10500
So he makes 252,000+10,500=$262,500 for the year