Math Problems Thread

[Post-Crisis D]

Let's say you have 1,000 dollars saved up.

On Monday, someone pays you $225 but you are only allowed to put $2 of that in your savings account.

On Tuesday, someone pays you $300 but you are only allowed to put $5 of that in your savings account.

If someone pays you $100 on Wednesday, how much of that would you be allowed to put in your savings account?  Or, would you have to take money out of your savings account?

There must be a formula for calculating that sort of thing, but I can't think of what it might be or what it might be called, which makes searching for a solution a bit difficult.

Any ideas?

[cuberoute]

It's y = mx + c.

https://www.mathsisfun.com/straight-line-graph-calculate.html

Point 1: x = 225, y = 2

Point 2: x =  300, y = 5.

We end up with y = 0.04x - 7.

So if you put in $100, you'd have to take $3 from the savings.

[Post-Crisis D]

It's y = mx + c.

Perfect!  Thanks!

Wish I remembered more of my math classes.  I use algebra often enough and I always remember people saying, when are you going to use any of that in real life?  Well, quite often actually.