The solution to this problem is A.
Answer:
$639.2
Step-by-step explanation:
sp = 80% of cp
= 0.8 x 799
= 639.2
The answer is 3x^2-12=-12, imiplies <span>3x^2 = - 12 + 12 = 0
so </span><span>3x^2 = 0 implies x = 0
there is one solution, x =0</span>
If Benny is 12 right now, that means that he is twice his sisters age because he is 200% of or 2 times his sister's age. His sister right now is 6 years old then.
After 4 years, Benny will be 16 (add 4 to 12) and his sister will be 10.
To find the percentage,divide his age by his sister's age and make it a percentage.
16/10=1.6=160%
Hope this helps.