How much to charge for housekeeping? -

I m going to do some housekeeping for a lady and she wants to no what i would charge here s what she wants done sweeping and mopping 4 rooms plus a hallway dusting vacuuming stairs and 4 rooms 1 a week at first then up to 3 days a week then some laundry may be included so how much do you think i should charge ?

Charge $12.00 per hour.