A transporter uses $x$ small trucks costing ₹400 a trip and $y$ large trucks costing ₹700 a trip, and wants the cheapest plan. Which is the objective?

Explanation

1. 01

   Write each resource as (amount used per unit) × (number of units), added over the products.

2. 02

   'At most' or 'available' gives ≤, 'at least' or 'must give' gives ≥; a profit is maximised and a cost minimised.