Hello sir can you identify the transformation then write the rule using arrow notation

How many $20 bills do you need to have to make $280

Jamie went to home depot. she bought 25 bags of soil that cost $9 per bag. she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each. she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jame pay at the end?

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15