Investors buy a studio apartment for $200,000. Of this amount, they have a down payment of $20,000. Their down payment is what percent of the purchase price? What percent of the purchase
price would an $80,000 down payment be?
Their down payment is 10% of the purchase price.
An $80,000 down payment would be 40% of the purchase price.

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?