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Mr john spends 1/4 of his monthly salary on the repayment of a housing loan.of the remainder he spends 1/5 on food and the pub bill,and puts aside 1/10 for transport costs .this leaves him with $630 a month.what is his monthly salary?plz show the steps

ali spends 2/3 of his money in a shop. he spends 1/4 of the remainder in another shop. what fraction of the original sum will be left? please provide all the steps

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thank u so much actually I don't know if it is from original or remaining cause this is from holiday homework thank u soooooooooooooooooo much