1 answer
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let her regular rate be $x per hour
let her overtime rate be $y per hour
first week: 40x + 7y = 390
2nd week: 42x + 8y = 416
1st equat x 8 ---> 320x +56y = 3120
2nd equt x 7 ---> 294x + 56y = 2912
subtract
26y = 208
y = 8
so her overtime rate is $8 per hour