Question 970842
Can plug in numbers and solve or rewrite the equation or do both.

eff =1− r^1−γ    I use eff to distinguish it from the number e

eff-1=-r^(1-y)    

1-eff=  r^ (1-y)

ln (1-eff)= (1-y) ln r

ln (0.45)=(1-y) ln (7.5)

-0.799=(1-y) *2.015

divide by 2.015

1-y=-0.397
y-1=0.397
y=1.397

0.55=1- 7.5^ (1-1.397)

0.55= 1 - 7.5^(-0.397)

0.55=1-0.45

gamma=1.397