A jewelry store marks up diamond sales 150%. A diamond ring is priced $2,400. Determine the wholesale price ( jewelry store's cost ) of the ring the commission paid to a sales associate who earns a 5% commission on the retail price ( customer's price ) of the ring and the profit that the store makes on the ring if ? State the three amounts and explain how you determined the profit. ( You may write a math statement to show the solution for the profit. )

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?