During a test of a single-cylinder four-stroke gas engine, the indicator diagram had an area of 900 mm² and a length of 70 mm; the indicator spring scale was 0.3 bar/mm. The piston diameter is 200 mm, the stroke 250 mm and the speed 300 rpm. Determine (a) the indicated mean effective pressure (in bar) and (b) the indicated power (in kW).