Table below shows the demand for haircuts from seniors and other customers on an average weekday in the local hairdressing shop.

Price of Haircut	Quantity Demanded by Seniors	Quantity Demanded by Other Customers
$24	2	8
22	5	9
20	8	10
18	11	11
16	14	12
14	17	13
12	20	14
10	23	15
8	26	16
6	29	17

a) Between the prices of $20 and $24, which of the two demands is more elastic? Round your answers to 2 decimal places.

The price elasticity of demand for seniors is ______

The price elasticity of demand for other customers is ______

The elasticity of demand is greater for (Click to select) seniors, other customers

b) What price would give the shop the greatest sales revenue?

_____