Find the exact circumference of a circle with the given radius. 3½ cm

How do you use the elimination method for this question? explain, because i really want to understand!

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?

What is 140% of 25? because i need