Princeton Avionics makes aircraft instrumentation. Its basic navigation radio requires $60 in variable costs and $4,000 per month in fixed costs. Princeton sells 20 radios per month. If the company further processes the radio, to enhance its functionality, it will require an additional $40 per unit of variable costs, plus an increase in fixed costs of $500 per month. The current sales price of the radio is $280. The CEO wishes to improve operating income by $1,200 per month by selling the enhanced version of the radio. In order to meet this target, the sales price to be charged for the enhanced product is