A sporting goods store is having a 25% - off sale. Mia who is a salesperson there wonders whether they should deduct the discount and then add the sales tax, or whether they should add the sales tax and then deduct the discount. What would you tell Mia? Why?

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.