A seed randomly blows around a complex habitat. It may land on any three different soil types: a high-quality soil that gives a 0.8 chance of seed survival, a medium-quality soil that gives a 0.3 chance of survival, and a low-quality soil that gives only a 0.1 chance of survival. These three soil types (high, medium, and low) are present in the habitat in proportions 30:20:50 respectively. The probability that a seed lands on a particular soil type is proportional to the frequency of that type in the habitat. If the probability that a seed dies before lt can land on any of the soil types is 0.2, what is the overall probability of seed survival?