If you move the decimal point up by one place - from 175.0 to 17.5 - that gives you 10%. But we need 6%, so we need to move the decimal point to the left once more: 17.5 --> 1.75 <-- This is 1% of 175. To find 6%, we just multiply the value for 1% by 6:
1.75 * 6 = 10.5
10.5 is 6%. To answer the question, we would subtract our value for 6% from the original ticket price: