Katrina paid $24.30 for a backpack that was marked down 10%. find the original
retail price of the backpack.
the original retail price of the backpack was

$26.73

Step-by-step explanation:

10/100 = 0.1

24.3 * 0.1 = 2.43

2.43 + 24.3 = 26.73

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: