So lets make this a simple math question. I don't know if the 10. is the question number or not, but anyway. If its 4 sweets, then its 4x=28 x=7 7p each sweet, 7p*7 total sweets= 49p.
If its 10.4 sweets then its just as simple...
10.4x=28p x=2.69. 2.69 * 7 sweets = 18.84p