F.1 English Mathematics 10點 急

1. A book marked at $M was sold at a discount of 20%. If the selling price of the selling price of the book is $120, then M =

M(1-20%)=120
M=$150

2.6月A把 $3700 存入銀行，利率為 0.9%/月
a)求一个月後之本利和(7月)
3700*(1+0.9%)
=$3733.3
b)A再把 a) 的數存入銀行,求8月的本利和
3733.3*(1+0.9%)
=$3766.8997

Let B's income be 3800/month, B uses x/360° for renting a flat. Find rent of the flat.
3800*(25/360)
=263.888...
=$264(corr.to 3 sig.fig.)

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