Need help ASAP PLEASE DUE LIKE AN A HOUR ???

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

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ac=26 and ch=8, find bh.