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a) Xavier: 40% of final cost

Yan: 30% of the remaining 60%
= 30/100 x 60%
= 18% of final cost

Zac: 100% – 40% – 18%
= 42% of final cost

40% of new price → $60
10% of new price →  $15
100% of new price → $150

100% of new price = 120% of original price = $150

120% of original price → $150
10% of original price → $12.50
100% of original price → $125

b) 42% of final cost 42/100 x $150
= $63


Check

  Share (%) Share ($) for original price Share ($) for new price
Xavier 40% 40% x $125 = $50 40% x $150 = $60
Yan 18% 18% x $125 = $22.50 18% x $150 = $27
Zac 42% 42% x $125 = $52.50 42% x $150 = $63
Total 100% $125 $150
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