What's the meaning of critical thinking.

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?

The tile along the edge of a triangular community pool needs to be replaced? ?