Last week Jack worked 70 hours and earned $1,260. If he earned his regular hourly wage for the first 40 hours worked, $$1\frac{1}{2}$$ times his regular hourly wage for the next 20 hours worked, and 2 times his regular hourly wage for the remaining 10 hours worked, what was his regular hourly wage?
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A $7.00
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B$14.00
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C$18.00
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D$22.00
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E$31.50