To estimate the size of the food delivery business using bikes, we can start by considering the number of households and their propensity to order food. Let's assume there are 100 million households. With 90% internet penetration, approximately 90 million households can potentially order online. Considering income distribution (20% low, 50% mid, 30% high), a significant portion, perhaps 30%, might opt for food delivery services for convenience, even if they own cars. This leads to about 27 million households ordering food. However, we need to factor in that not all deliveries will be by bike. Factors like distance, weather, and the availability of other services (like car delivery or meal kits) will influence this. If we conservatively estimate that 20% of these orders are suitable for bike delivery, we arrive at approximately 5.4 million orders potentially fulfilled by bikes. This is a rough estimate, and a more precise calculation would require data on order frequency, average order value, and the specific market share of bike couriers.