SOLUTION: A cup of coffee is split on a carpet.it makes a stain that is 200cm^2 in atea. The stain contuinues to grow in size. In the first minute, the area of the stain grows by 40cm^2. In

Question 1058608: A cup of coffee is split on a carpet.it makes a stain that is 200cm^2 in atea. The stain contuinues to grow in size. In the first minute, the area of the stain grows by 40cm^2. In successive minutes it grows by 20 percent of the previous minute's growth. What is the final area of the stain?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
The growth is the first amount divided by (1-r), where r is 0.20
The first minute is 40, the second is 8, the third is 1.6 and the final is 40/0.8=50 cm^2 of total growth.
This can be done with the first value of 200 and divide that by 1-r; 200/0.8=250 cm^2 of final area.
RELATED QUESTIONS
BENNET CUSTOM FLOORING HAS 0.5 GAL OF STAIN THAT IS 20% BROWN AND 80% NEUTRAL. A CUSTOMER (answered by ankor@dixie-net.com)

You are staining a coffee table you just made. After testing some sample pieces of wood,... (answered by solver91311)

Sue has a big old wooden box without a top. The bottom of the box is 58 feet by 23 feet.... (answered by josgarithmetic,MathTherapy)

A can of deck stain will cover 250 squared feet. How many cans of stain should be... (answered by TimothyLamb)

Your mom is wants to put a stain glass window above the front door. It's shape is a... (answered by Aldorozos)

I am trying to help my child with his homework. The problem is "Gary is going to stain a (answered by stanbon,richwmiller,dabanfield,jsmallt9)

A rectangular prism-shaped wooden board has a length of 48 inches, a width of 4 inches... (answered by ikleyn)

A rectangular prism shaped wooden board has a length of 48 inches, a width of 4 inches... (answered by addingup)

Sam can stain his deck in 9 hours. His sister Grace can stain the deck in 12 hours. How... (answered by josgarithmetic)