For percentage reduction, we need to know both the original price and quantum of reduction. Hence each statement alone is INSUFFICIENT
Combining both,
Since the original price is not known, we can not calculate perecentage reduction. Hence both the statements together are INSUFFICIENT.
Hence E.

(NOTE :
'Save' means total savings on 144 candies
= (amount saved on one candy)*(no. of candies)
= 0.36*144 = $51.84)
So amount of reduction in price of candies = amount of saving)