Why Most PRICES END with 9? #LLAShorts 30

Why do household buy more at a lower price than at a higher price ?

When the price of a commodity falls from Rs.10 to Rs.9 per unit, its quantity falls by 30% . Calculate price elasticity of supply.

A consumer buys 30 units of a good at a price of ₹ 10 per unit. Price elasticity of demand for the good is (-) 1. How many units the consmer will buy at a price of ₹ 9 per unit ? Caculate.

A consumer buys 30 units of a good at a price of ₹ 10 per unit. Price elasticity of demand for the good is (-) 1. How many units the cosumer will by ata price of ₹ 9 per unit ? Calculate.