Last week's gas prices at a local gas station decreased by 4% this Monday, but by this current weekend, they have increased by 8%
The current price this weekend is _____ % of last week's prices before the changes.

Question

Last week's gas prices at a local gas station decreased by 4% this Monday, but by this current weekend, they have increased by 8%
The current price this weekend is _____  % of last week's prices before the changes.

danjs · Answer

I would just say -4% + 8%

but, The initial price P decreased by 4%,  on monday the price was 0.96P

You now increase the price on monday by 8%

anonymous · Answer

Ok, but I don't get where the .96P comes from?

danjs · Answer

If you let the initial price be P, then the price on Monday will be 4% less, or 96% the original Price

0.96*P    mondays price

danjs · Answer

Not sure if they are asking, 
"but by this current weekend, they have increased by 8%"

Is that 8% increase of the original Price, or the Price on Monday

anonymous · Answer

The price on Monday

danjs · Answer

ok, 
then you increase mondays price - (0.96)P by 8% 

Price on weekend is 108% of 96% of the original Price

 New Price = (1.08)*(0.96)*P

danjs · Answer

So the new price is 1.0368*P  

or 103.68% of last weekend price P

danjs · Answer

increase overall of 3.68%

danjs · Answer

good?

anonymous · Answer

Good. Thank you so much!!

danjs · Answer

welcome, anytime