房屋和存款的年利息

Question

假设您目前有$ 50,000存入一个银行帐户，并且该帐户每年向您支付3.5％的固定利率。您打算购买当前价格为$ 300,000的房子。价格将每年增加1.5％。它仍然需要最低房价的20％作为首付。

编写一个while循环以计算您需要支付多少（整数）年，直到您有能力支付首付来购买房屋。

m = 50000 #money you have
i = 0.035 #interest rate
h = 300000 #house price
f = 0.015 #amount house will increase by per year
d= 0.2 #percent of down payment on house
y = 0 #number of years
x = 0 #money for the down payment

mn = h*d #amount of down payment

while m <= mn:
   m = (m+(m*i)) #money you have plus money you have times interest
   y = y + 1 #year plus one
   mn = mn +(h*f*y)

print(int(y))

您应该得到的答案是10。

我一直得到错误的答案，但是我不确定什么是错误的。

Answer 1

您可以使用复利公式简化代码。

list2

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如果允许您不使用while循环，则可以解决m = 50000 # money you have i = 0.035 # interest rate h = 300000 # house price f = 0.015 # amount house will increase by per year d = 0.2 # percent of down payment on house y = 0 # number of years def compound_interest(amount, rate, years): return amount * (rate + 1) ** years while compound_interest(m, i, y) < d * compound_interest(h, f, y): y += 1 print(y) 年之后的不等式。

  

因此您将获得以下代码段：

y