In many industries, the cost of materials and supplies used in production amounts to what share of sales revenues?

1. Resource planning is a big part of any production strategy, and cost is one reason why. 2. In many industries the cost of materials and supplies used in production reaches as much as half of sales revenues. 3. When half of every rupee of sales goes on materials, a small saving on purchasing moves profit sharply. 4. That is why the make-or-buy decision and supplier relationships receive so much attention. _Source: OpenStax Introduction to Business (CC BY 4.0), Ch 10 "Achieving World-Class Operations Management", section Pulling It Together: Resource Planning_