To find the answers to these kinds of percentage questions you just multiply your number (318) by your percentage and then divide it by 100. So:
318 * 75 = 23850
23850 / 100 = 238.5
18% of 318= 18% * 318= 0.18 * 318= 57.24
73% of 318= 73% * 318= 0.73 * 318= 232.14
25% of 318 = 79.5
70% of 75 = 75*70/100 = 52.5
45
75% of $45.00 = $33.75
It is: 75-15 = 60
26.25
75
75
410.75
75% of 700.00 = 75% * 700 = 0.75 * 700 = 525.00