You're missing the big point: This is on top of the original figure (added to).
so 175% more than 40% is 110%
let's work with actual numbers, shall we?
say (as in previous example) 100% is 100 units.
40% of this is 40 units.
still with me?
we increase the 40 units by 175% (175% of the 40 units).
first off, what are we doing?
we are adding an additional 175% of these 40 units to this amount.
40 * 1.75 (we all agree here 1.75 = 175%) = 70 (can be checked with a calculator for those who are slower)
this is the amount we are adding to the original 40 units.
original units + 175% of those units = new total units
40 + 70 = 110 units now total.