A shirt originally cost $38.30, but it is on sale for $34.47.What is the percentage decrease of the price of the shirt ? If necessary, round to the nearest percent

The answer to your question is 10%

Step-by-step explanation:

Data

Original cost = $38.30

Price after discount = $34.47

Percent of decrease = ?

Process

1.- To solve this problem use proportions and cross multiplication. The original cost will be 100%.

                  38.3 % 100%

                   34.47%  x

                   x = (34.47 x 100)/38.3

                   x = 3447/38.3

                   = 90 %

2.- Calculate the percentage of decrease

    Result = 100 - 90

               = 10%

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:

the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844