Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
40% of the mosquitos in Jack's area are infected with malaria. 20% of the mosquitos are infected with Zika virus. Without a vaccine, the chances of getting infected with either virus after getting bitten by an infected mosquito are 50%. Jack is taking an experimental malaria vaccine that reduces the chances of getting infected after getting bitten by 50%. If Jack gets bitten by a random mosquito, what is the percentage chance he catches either Zika virus or malaria?

### Response:
 ก่อนอื่นให้หาโอกาสที่แจ็คจะถูกยุงที่ติดเชื้อกัด 40% + 20% = 60%
โอกาสที่จะติดเชื้อหลังจากถูกยุงกัดคือ 60% * 50% = 30%
จากนั้นหาโอกาสที่จะเป็นโรคหลังได้รับวัคซีน 30% * 50% = 15%