Robert and katie masterson bought 99 shares of oil stock at a price
of $55 per share and 150 shares of stock in a steel company at $24 per share. the broker’s commission
is $25 for transactions under 100 shares and $0.20 per share for transactions over 100
shares. what is the total combined amount that the mastersons paid for both stock transactions?

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?