Question

         Three friends are renting an apartment. They pay landlord first

Answer 1

Let 
x----------------------- > monthly rent

we know that

first month’s rent----------- > x
security deposit-------------- > 0.5 x
utility bill------------------------ > 0.40 x
health club-------------------- > 0.05 x
other services----------------- > 3*0.13x------ > 0.39x

$2574=[x+0.50x+0.40x+0.05x+0.39x]-------- > 2574=2.34x
x=2574/2.34=1100

the answer is $1100