Problem Solving (PS) | Re: Jack's monthly remuneration includes a fixed salary and a fixed comm

salary= Fixed Salary (FS) + Fixed compensation (FC)

4000=FS + FC*30
6000= FS+ FC*50
Solving both the equations
FC=100
now put FC in either of the equation to find FS
4000=FS+ 100*30
so,FS=1000

now 7200=FS+FC*50+ 20* reduced value of FC (let it be a)
solving the above equation we get a=60
Now here is the trick don't get confused 100-60= 40 $ so you have to reduced 40 dollars in the FC for conignments above 100.It is mentioned that there is an x% decrease.So find out percent decrease (100-60)/100*100=
...

---