Factorise using suitable identities (0.1x-0.2y)^2 plzzz help

What is the value of the expression below? (81^2)^1/8

Marlow is comparing the prices of two trucks rental compaines company a charges $3 per hour and an addtional $75 as serivce charges company b charges $2 per hour and an additional $85 as serivce charges

I'm confused on this could anyone me and show me what i need to do to solve it.