To calculate the stake required, it is the (original price/lay price required)*Stake.
eg. You have backed a horse for £50 at 5.0 for a potential profit of £200 The odds drop to 4.0 so you can now green up by laying the horse. To calculate the stake divide 5.0 by 4.0 and multiply by the original stake = £62.50, liability = £187.50. You now have a guaranteed profit of £12.50 whatever the result.
To calculate the stake required, it is the (original price/lay price required)*Stake.eg.You have backed a horse for £50 at 5.0 for a potential profit of £200The odds drop to 4.0 so you can now green up by laying the horse. To calculate the stake di