Answer
$112.2$
Work Step by Step
$A= 520$
$C=341$
$T=38$
$Y=4381$
$I=5$
$\text{Rating} = \dfrac{\left(250 \,\dfrac{C}{A} \right)+ \left(1000 \, \dfrac{T}{A} \right)+ \left(12.5 \, \dfrac{Y}{A} \right)+6.25 -\left(1250 \, \dfrac{I}{A}\right)}{3}$
$\text{ Rating } = \dfrac{\dfrac{250C+1000T+12.5Y-1250I}{A}+6.25}{3}$
$\text{Rating } = \dfrac{\dfrac{250\times 341 +1000 \times 38 + 12.5 \times 4381 -1250 \times 5}{520}+6.25}{3}$
$\text{Rating } \approx \dfrac{330.3125+6.25}{3}$
$\text{ Rating } \approx 112.2$
