A $1,000 deposit for 20 years earns simple interest of 4%, how much interest has the account earned? *

$800

Step-by-step explanation:

You are going to want to use the simple interest formula for this. The one below is modified for solving the interest earned:

I = interest amount

P = principal amount

r = interest rate (decimal form)

t = time (years)

First, change 4% into its decimal form:

4% -> -> 0.04

Now, lets plug in the values into the equation:

The interest earned after 20 years is $800

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: