Formula for calculating price

[nander]

I need a one cell formula that calculates a price based on the following
conditions

Items costing the Contractor $50 or less are marked up 100% witha
profit margin on the selling price of 50%
items costing 50.01 to 100 are marked up 80% with a profit margin on
selling price of 44.44%
items costing over 100 are marked up 60% with a profit margin on the
selling price of 37.50%

 

[JE McGimpsey]

One way:

=A1*LOOKUP(A1,{0,2;50.01,1.8;100.01,1.6})