Wrong divisor.
PRIMARY 6 · MATHEMATICS
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Approximate. Re-set: original − 0.35 × original − 48 = 87 → 0.65 × original = 135 → original = 207.69 ≈ 208.
This treats the $48 as 35%. Apply 35% only to the original, then subtract $48 separately.
This solves 0.65 × original = 156 (= 87 + 69 incorrectly). Use 87 + 48 = 135 instead.
Applied 10% decrease to the original $300 (= $270) and forgot the 20% increase entirely.
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