A businesswoman invests $28,000 into two accounts: one that returns 6% annual interest and one that returns 5% annual interest. After 1 year, she earns $1,557.50. How much did she invest in each account?

A. No solution
B. 12,000 in the 6% bearing account, 16,000 in the 5% bearing account.
C. $5288.50 in the 6% bearing account, $22,711.50 in the 5% bearing account.
D. $15,750 in the 6% bearing account, $12,250 in the 5% bearing account.

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values

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