英數!!!急!

2007-05-16 4:39 am
3) Venus borrows $20000 from a bank. It changes simple interest at an interest rate 6.5% p.a. Whan she returns the money to the bank, besides the sum of money she has borrowed, she needs to pay $1950 to the bank too. How long does Venus borrow the money from the bank?

回答 (2)

2007-05-16 4:50 am
✔ 最佳答案
3) Venus borrows $20000 from a bank. It CHARGES simple interest at an interest rate 6.5% p.a. Whan she returns the money to the bank, besides the sum of money she has borrowed, she needs to pay $1950 to the bank too. How long does Venus borrow the money from the bank?


Let y be the no. of years she had borrowed,

20000+(20,000 x 0.065n)=20000+1950
20,000 x 0.065n=1950
n=1950 / (20000 x 0.065)
n=1.5

Therefore she borrowed the money for 1.5 years

2007-05-15 20:51:41 補充:
打錯左... n 即 y
參考: Myself (我讀account架)
2007-05-16 4:56 am
20000 x 6.5% x years that Venus borrows the money+20000=20000+1950
years that Venus borrows the money=1950÷(20000 x 0.065)
=1.5years
=18 months


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