270 kW of power is required to crush 150 tones/h of a material. If 80% of the feed passes through a 50 mm screen and 80% of the product passes through a 3 mm screen, calculate the work index of the...

270 kW of power is required to crush 150 tones/h of a material. If 80% of the feed passes through a 50 mm screen and 80% of the product passes through a 3 mm screen, calculate the work index of the material. What will be the power required for the same feed at 150 tones/h to be crushed to a product such that 80% is to pass through a 1.5 mm screen?