The sales tax on a 15,000 car is 540. at this rate what is the tax on a 32,000 car

Note : Since unit of currency is not defined, I'll be using units.

Sales tax on a 15000 units car = 540 units

540 = 15000 * tax% / 100

=> 540 = 15000 * tax% / 100

=> 540/15000 = tax% / 100

=> tax% = (540/15000) * 100

=> tax% = 540/140

=> tax% = 3.6

now,

sales tax on a 32000 units car = 32000 * tax%/100

= 32000 * 3.6/100

= 320 * 3.6

= 1152 units

therefore sales tax on a 32000 units car = 1152 units