The cost of 500 ml milk packet under the Kabilai Offer Plan is ₹29, (Actual cost-₹ 36) For example, if you choose the 3-month plan, you will pay ₹3240 for 90 days of delivery.
With the offer, you get 21 days free, so the total duration is 111 days(paid + free).
Cost calculation:
₹3240 / 111 days = ₹29.1 per packet.