When Billy was first hired, he was paid at a rate of $10 per hour.  After 2 months, he was given a raise of $0.50 per hour.  On his first anniversary at work, he was given a raise of $1.00 per hour.  Sally just started working at a different business, and her starting salary is $0.50 more per hour than Billy's starting salary was.  If both Billy and Sally work 20 hours, how much more money will Billy earn than Sally, in dollars?
How much does Billy make per hour? ** Billy has a salary of $10+0.50+$1.00=$<<10+0.5+1=11.50>>11.50 per hour.
How much does Sally make per hour? ** Sally is paid $0.50 more per hour than Billy's initial salary, for a total of $10+$0.50=$<<10+0.5=10.50>>10.50 per hour.
How much will Billy be paid in total? ** If Billy works 20 hours, he will be paid 20*$11.50=$<<20*11.5=230>>230
How much will Sally be paid in total? ** If Sally works 20 hours, she will be paid 20*$10.50=$<<20*10.50=210>>210.
How much more money will Billy earn than Sally, in dollars? ** Thus, if both work 20 hours, Billy will be paid $230-$210=$20 more.
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