Can UberEats/DoorDash driver deduct a portion of computer/tablet purchases if using it for record keeping?

Hi, I plan to replace my computer and tablet this year and wonder if I can deduct part of the purchases? I will use them partially for record keeping with Excel, eg. manage mileage tracked by cellphone, keep track of expense/income, keep track of device usage to figure out business portion, same as I do with current ones and cellphone just can't do the same efficiently. 

 

I expect the business portion for computer would be over 50% but probably 20% for tablet.