4x + 7y - 3x - y show work please

Suppose investors can earn a return of 2% per 6 months on a treasury note with 6 months remaining until maturity. the face value of the t-bill is $10,000. what price would you expect a 6-month maturity treasury bill to sell for? (round your answer to 2 decimal places. omit the "$" sign in your response.)

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?

Can someone me find the original price? the discount is 5% and the sale price is $68.40