Tricky word problem. Hi I'm having trouble figuring out how to approach this word problem and wonder if anyone had tips. Problem: Just suppose, for the sake of argument, that you have a large block of stone. While staring at this block of stone, it dawns on you that perhaps you should carve it into something. Luckily, you have a hammer and chisel handy. But it's no ordinary hammer and chisel. Somehow, no matter how hard you hit the chisel, exactly one-half of one percent of the block chips off. How many times do you have to hit the chisel before the block is less than half of its original size?