Can anyone here do math again???

Question

I just posted the question, "if something is .89 (cents) per sqaure foot, & I bought 8 feet, how much will it cost?"
...this pond liner I need to by is 8 feet by 20 feet, and I forgot to mention that.

Answer 1

Rate = 0.89 per sq feet
Size of materials = 8 feet by 20 feet = 8x20 = 160 sq ft
Cost of materials = 160sq ft by $0.89 = $142.40

It will cost you $142.40 to buy the required amount of pond liner

Answer 2

($.89)(8)(20) = $142.40

Answer 3

then 8x20 = 160ft2

you just multiply it

0.89 x 160 = ?

sori i dont have a calculator