At first it increased by 25% and then decreased by 40%

12%

Step-by-step explanation:

Let the original salary be Rs a

Salary after increase = a + 40% of a

= a + 40a/100

= 140a/100

= 14a/10

= 7a/ 5

Salary after Decrease = 7a/5 - 20% of 7a/5

= 7a/5 - 20× 7a / 100 × 5

= 7a/5 - 7a/25

= ( 35a - 7a) / 25

= 28a/25

Absolute increase = 28a/25 - a

= 3a/25

Percentage = 3a/25 ×100 / a

= 3 × 4

= 12%

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:

depending on others is critical to survival. my source is apex!

step-by-step explanation: