What is the least number of whole hours that the employee must work i…

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An employee earns

30 p er h o u r f or t h e f i r s t 40 h o u r s w or k e d ina w ee k . F or e a c hh o u r w or k e d o v er 40 h o u r s, t h ee m pl oy eee a r n s

45 per hour. [cite: 1607, 1608, 1609]

What is the least number of whole hours that the employee must work in a week to earn at least $1,610?