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Before —
Qian Qian : 4 units + 60
Jeriel : 4 units

After —
Qian Qian : 3 units + 45
Jeriel : 2 units

3 units + 45 – 2 units = 54
1 unit = 9
4 units = 4 x 9 = 36

(b)
4 units + 60 – (3 units + 45) = 1 unit + 15 = 9 + 15 = 24

Ans : (a) $36; (b) $24.

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