Rich also has £400 pounds invest 3% compound interest . How many years does he need to invest the money to get at least £475

6 years

Step-by-step explanation:

Formula to calculate compound amount: , where P= Principal , r=rate of interest, t= time

Given: P = £400, r = 3% = 0.03 , A= 475

Required equation:

Taking log on both sides , we get

Hence, he needs to invest the money for 6 years to get atleast £475.

it has to have an angle of 90 degrees

answer is  

c.

56

hope you get this right