The probability that interest rates on housing loans will go up in the next 6 months is estimated to be 0.20. The probability that house sales will decrease is estimated to be 0.6. The probabilty that interest rates will go up and house sales will decrease is estimated to be 0.15.

a) The probability of an increase interest rates and not a decrease in house sales is

b) The probability of not an increase in interest rates and not a decrease in house sale is