It isn't clear according to what rule you want to rearrange them. You can add them in any order; the result is the same.
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To do it in your head: think (60 + 8) + (80 + 5) then rearrange (still in your head): (60 + 80) + (8 + 5) 140 + 13 153
700
140 is 140 to the nearest tenth.
7% of 140 = 7% * 140 = 0.07 * 140 = 9.8
140 and the half of 140 is 90 the half of 90 is 45 the half of 45 is 22.5 the half of that is 10.5.2