First time poster and somewhat novice user.

I'm running across a project that requires multi-tiered multiplication and wondering if I'm in the right place or way over my head (I believe both to be true).

Here is an example using generic numbers:

The entered value is 300

The first 100 of that value needs to be multiplied by 5 (500)
The next 150 needs to be multiplied by 4 (600)
The next 250 (or last 50 in this case) needs to be multiplied by 3 (150)

1,250 total.


I'm guessing this is so simple I missed it, or way past my abilities. I believe the latter to be true but would love a starting point to start educating myself. In reality, the task would be easy enough for me to do by hand but looking to improve my skills.