During a sale, notebooks were sold at a 20% discount. Nat wanted to buy 20 notebooks but was short of $26.20. After borrowing $6.36 from him mother, he had enough to buy exactly 12 notebooks.
(a) What is the usual price of the notebook?
(b) How much money does Nat have at first?
(a) x: the usual price of the notebooks
0.8x * (20 - 12) = 26.20 - 6.36
0.8x * 8 = 19.84
x = 19.84 / 6.4 = 3.1
So the answer is $3.1
(b) 3.1 * 0.8 * 20 - 26.2