One cup of popcorn that produces 131kj when burned in a calorimeter

The amount of kilo calories in one cup of popcorn that produces 131 kj when burned.
1 kilo calorie is equivalent to 4.184 kilo joule
Therefore, 131 kilo joule will be equivalent to;
 131 kj × (1/4.184) = 31.3097 kilo calories
Therefore, the cup of popcorn will produce 31.3097 kilo calories