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InqkBleed
It's 420

This is because 70x4=420. It's within 300 and 500, and its 20 greater than 400 a multiple of 100. 
acctforowen
The answer is 420. It is a multiple of 70, it is between 300 and 500, and it is 20 more then 400 which is a multiple of 100.