Is it a specialty store that requires product experience, knowledge, ability to discern customer needs, etc in order to earn repeat business, or is it general retail? Is the clerk also expected to do anything else? Is initiative and discernment required for those tasks or are they assigned by a manager or leader? Are payroll taxes and fringe benefits accounted for separately? Is the local labor pool and wage for similar positions able to supply your need at the hours and days you need the help? Can you cover if the individual assigned to the shift just doesn't show that day?

Wages start at over $17 / hr in rural northern MI, plus substantial healthcare, leave, and retirement, for reliable and disciplined unskilled help, in a career path and location that has very substantial opportunity for advancement.

There are 50 questions here and I can't answer them for you, but the answers will help inform your estimates. Hope this helps