The population of the city ten years back was 6,349,309. While looking at the current population number, Moses observed that the hundred thousands place has increased by 4, the hundreds place has increased by 4, the ones place has decreased by 7, and all the other digits remained the same. By how much has the population changed in the last 10 years?
1) 400393
2) 400407
3) 40393
4) 400402
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