Please answer the following question by reasoning step-by-step.
Jason spent 1/4 of his money and an additional $10 on some books. He then spent 2/5 of the remaining money and an additional $8 on some DVDs. If he was left with $130, how much money did he have at first?

320
Let X be the money Jason had at first.

Jason spent 1 / 4 * X + 10 on books.

Jason spent 2 / 5 * [X - (1 / 4 * X + 10)] + 8 on some DVDs.

Jason has X - (1 / 4 * X + 10) - {2 / 5 * [X - (1 / 4 * X + 10)] + 8} = $130 left.

X - 1 / 4 * X - 10 - 2 / 5 * X + 1 / 10 * X + 4 - 8 = $130.

9 / 20 * X - 14 = $130.

X = $320.

.

The answer: 320