✔ 最佳答案
1)
The percentage of 50 g in 1 kg (1000 g) = (50/1000) x 100%
The percentage of 50 g in 1 kg (1000 g) = 5%
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2)
Interest = Principal x Rate x (No. of Periods)
I = P x R x n
1500 = 5000 x 5% x n
n = 1500 / (5000 x 5%) years
n = 6 years
Ans: The period of deposit = 6 years
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3)
I = P(1+R)n - P
I = $3000x(1+5%)2 - $3000
I = $3307.5 - $3000
I = $307.5
Ans: The total compound interest in 2 years is $307.5
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4)
Speed of car A = 54 km/h
Speed of car A = 54 x (1 km/1 h)
Speed of car A = 54 x (1000 m/3600 s)
Speed of car A = 15 m/s
Speed of car A : Speed of carbon B = 15 m/s : 24 m/s
Speed of car A : Speed of carbon B = 15 : 24
Speed of car A : Speed of carbon B = 3x5: 3x8
Speed of car A : Speed of carbon B = 5 : 8
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