I answered " 'Sunny' is mentioned but not defined and it is impossible to determine if the events are independent. The question is too ambiguous to draw a conclusion with the data given.'
If you assume that 'not rainy' = 'sunny' and that both days are independent events:
(50/100) of sun on Saturday and (70/100) of sun on Sunday (30% chance rain = 70% sun)
(.50*.70) = 35% chance of sun over both days assuming independence
You should think about that hard though.
Answer is:
Assuming again that not rainy = sunny. They both occur on the same weekend so they are a union:
(.50 + .70) - 1 = .2
20% chance of it being sunny over both days of the same weekend.
You had to leave that in a neg rep, dude? Seriously, your mannequin is lonely. Take her out for a night in the basement, to nosh on cabbage and blood soup.