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   25%=1/4

            Before      change        after

Saving    1u           -9                 0.4u

Spend     3u          +9      

60/100×1u=0.6u (saving drop)

1u-0.6u=0.4u (saving in the end)

0.6u=9

1u=9÷0.6=15

4u=15×4=60

60×4=240

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