Brian invests £990 into his bank account. He receives 2% per year simple interest. How much will Brian have after 4 years?

brian will get $ 1069.2 after 4 year  

Given:-

Brian invest ( principle )$ 990

rate = 2%

Time = 4

To find:-

How much will Brian have after 4 years

Solution:-

Here,    

brian will get $ 1069.2 after 4 year

Step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204