PLEASE HELP OR I WON'T GET MY CREDITS

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

What is 140% of 25? because i need