FAT × rate (fat-point)
Rate = fat reading × your per-point rate. The commonest method in north Indian dairies.
If your per-point rate is ₹9 and the sample reads 6.4 fat, the milk is priced at ₹57.60 a litre. Only the fat box is needed, so the entry form hides SNF entirely for these members.
Cow and buffalo can carry different per-point rates. Mixed milk uses the buffalo rate.
Dairywala looks for a rate in a fixed order: the member's own cow or buffalo rate first, then the member's single rate, then the dairy's central rate for that animal. The first one it finds is used, so a member-level rate always beats the dairy default.
A fat-point member can also be priced from a fat-only rate chart if you keep one — see the rate chart pages.
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