Rona buys a takeaway meal for her lunch. She orders a small serving lf potato fries and a humbucker with a calorie content of 255 Cal and 521 Cal respectively.

Question

If the daily - recommended energy intake for her age is 8400 kj, calculate the percentage (to the nearest whole number) that this meal represents of Rona's daily energy requirements.

Answer 1

In case you still need help with the problem.

This requires conversion of Calories to Kilojoules

You need to remember that 1 Calorie = 1 Kilocalorie and that 1 Kilocalorie = 4.184 Kilojoules

So if the takeaway meal has a TOTAL Calorie amount of 255 + 521 = 776 Calories

Then convert that to Kilojoules...

776 Cal x (4.184 kJ/ 1 kC) = 3,246.80 kJ

To find the percentage of the energy provided by the takeaway meal relative to the daily energy intake requirement, you use the ratio of the takeaway over the daily recommended energy intake (8400 kJ) and multiply 100.

Therefore... (3246.80 / 8400) x 100 = 38.65% OR round up to the nearest whole number of 39%

Hope this helps...