How are problems like these solved

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

How do u write a function for the reflection across the y axis

Kate is arranging new furniture in her rectangular sitting room. she has mapped the arrangement on a coordinate pane. a,b and c represent the sofas, v1 and v2 are decorative vases and aq the aquarium. find the distance between v1 and the aquarium. any body you