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ATQ,
79.97% of (? + 319.96) + 15.99 = 400.01
80% of (? + 320) + 16 ~ 400
0.80 X (? + 320) ~ 384
? + 320 ~ 384 ÷ 0.8
? + 320 ~ 480
? ~ 480 - 320
? ~ 160
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