Me asap will give brainalist solve

3. $18 off or 15%
we want to know when these are the same so

when the price is 120 18 off will give you a price of 102. 15% off will give you a price of 102 as well.

4. 48 computers 30% increase
you just need to find 30% of 48 and add it to 48
48×.3=14.4
14.4+48=62.4 so they need to sell 63 computers. if they only sell 62 it is less than 30% and they cant sell 2/5 a computer!
5. buys at 12 sells at 30
discounted 25% buys 2 with 4% tax
discounted price is 30-30×.25=22.5
so 2 shirts is 22.5+22.5=45 multiply by .04 to get tax 1.80 add this to find the total 46.80

discounts by 55% so find 55% of 30 and subtract from 30 this is 13.5 since she buys them for 12 she will make 1.50 on each shirt.

Your maths is very weak try yourself this would improve your skills don't depend on others