Probability and Statistic plzzzzzzzzzzz helpppppp!!!!!!!!!!!?

A warranty is written on a product worth 10000 so that the buyer is given 8000 if it fails in the first year, 6000 in the second year, 4000 in the third, and 2000 in the fourth, and zero after that. The probability of the product's failing in a year is 0.1; failures are independent if those of the other years. What is the expected value of the warranty?