The number 360 is increased by 75%. the result is then decreased by 50%. what is the final number

The number 360 is increased by 75%

360 + 360 x 75 / 100 = 360 + 270 = 630

The result is then decreased by 50%

630 - 630 x 50 / 100 = 630 - 315 = 315

What is the final number

315

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt