if then

Hello

i have a buisiness with workers

i will use two texts

if var1 is 10-19 workers then var2=8

if var1 is 20-49 workers then var2=9

if var1 is 50-9 workers then var2=12

if var1 is 100-249 workers then var2=17

if var1 is 250-499 workers then var2=23

if var1 is 500-999 workers then var2=40

if var1 is 1000-1999 workers then var2=75

if var1 is 2000-3999 workers then var2=100

if var1 is 4000-5999 workers then var2=120

if var1 is 6000-9999 workers then var2=160

if var1 is 10000+ workers then var2=250

can somebody help me?

Thanks