If something cost 70.00 and is 30% off, imagine that for each 10.00 of original cost you will get 3.00 off, so 3.00 x7.00= 21.00, so your discounted cost will be 70.00-21.00= 49.00
If something cost 70.00 and is 35% off, imagine that for each 10.00 of original cost you will get 3.50 off, so 3.50 x7.00= 24.50, so your discounted cost will be 70.00-24.50= 45.50
If something cost 80.00 and is 40% off, imagine that for each 10.00 of original cost you will get 4.00 off, so 4.00 x8.00= 32.00, so your discounted cost will be 80.00-32.00= 48.00
Each 10% of 10.00 is 1.00
If something cost 70.00 and is 35% off, imagine that for each 10.00 of original cost you will get 3.50 off, so 3.50 x7.00= 24.50, so your discounted cost will be 70.00-24.50= 45.50
If something cost 80.00 and is 40% off, imagine that for each 10.00 of original cost you will get 4.00 off, so 4.00 x8.00= 32.00, so your discounted cost will be 80.00-32.00= 48.00
Each 10% of 10.00 is 1.00