F.3百分率【4題】

4) 設時間為 t。

$10000(1 + 4%)t - $10000 = $1698.58

$10000(1 + 4%)t = $11698.58

(1 + 4%)t = 1.169858

1.04t = 1.169858

t = 4

一共需要 4 年時間。

5a) $8000(1 + 8%/4)4

= $8000(1.02)4

約= $8659.46

5b) $8160(1 + 6%/12)2x12 - $8160

= $8160[(1.005)2x12 – 1]

約= $1037.6

6) [$5000(1 + 4%)6 - $5000] – [$5000(1 + 4x6/100) - $5000]

約= $1326.595 - $1200

約= $126.595

7) 設年利率為 r。

$20000(1 + r%/3)3 = $21854.54

(1 + r%/3)3 = 1.092727

1 + r%/3 = 1.03

r% = 0.03

r = 3

年利率為 3%。

睇5到第一題 可5可以打多次?