B i think that because there’s no quantity
Help you with what? Be specific. <span />
I think you have to do 120-60% and the answer is 48 dollars.
#Equation of m?
<h3>Equation</h3>
m = E/c²
<h3>Way to find it</h3>
E = mc²
E : c² = m
E/c² = m
So, the formula of m is E/c²
