I think that would be way more than 15 syns, egg fried rice is only 4 syns for a 300g portion on green or EE. Can't find sweet and sour crispy shredded chicken on the websire but think it's fried so will be high. Sweet and Sour battered chicken is 17.5 syns, so may be a similar syn value? Prawn crackers are 2 syns each i think.