Kersha has two jobs. During the day she works as an office clerk, and in the evening she works as a cashier. Her office job pays
her $12.00 per hour. Her cashier job pays her $8.25 per hour. In one week, Kersha worked 55 hours. She earned a total of $585. How many hours did Kersha work in each job?
Let x = hours worked as a clerk ($12 per hour).Let y = hours worked as a cashier ($8.25 per hour).She worked 55 hours, thereforex + y = 55 (1)She earned $585, therefore12x + 8.25y = 585 (2)From (1), obtainy = 55 - x (3)Substitute (3) into (2).12x + 8.25(55 - x) = 58512x + 453.75 - 8.25x = 5853.75x = 131.25x = 35y = 55 - x = 55 - 35 = 20 Answer: c) Office clerk: 35 hours; cashier: 20 hours.
Use compound interest formula: Future value, F 25000=P(1+i)^n where P=present value to be found i=annual interest rate = 0.065 n=number of years = 6 so 25000=P(1.065)^6 => P=(25000/1.065^6)=$17133.353
