JK Tyre & Industries Ltd's fourth-quarter profit rose nearly threefold as raw material costs fell and domestic demand saw a boost. The tyre-maker supplies to Maruti Suzuki India Ltd and Tata Motors Ltd, and its revenue from operations grew almost 10%. Rubber prices have softened 3% from the December quarter, when the effects of easing prices had already begun reflecting in the company's bottomline. Cost of raw materials fell more than 4% to 21.