急~~帮忙,英文数学题!An item marked at $M is sold at a discount of 2%. If the selling price of the item is $(M-0.12),find the value of M.

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• 急~~帮忙,英文数学题!An item marked at $M is sold at a discount of 2%. If the selling price of the item is $(M-0.12),find the value of M.
• 英语翻译If each foot of water in a lake screens out 60% of the light above,what percent of the light passes through 5 feet of water?Raul invests $1000 in a savings account that earns 5% interest compounded annually.How much money will he have in the account at the end of 5 years?
• A is a natural number .if A subtracts 1,3,5...(some continous odd numbers )until it cannot subtract more ,the result will be 29 ;if A subtracts 2,4,6...(some continous even numbers )until it cannot subtract more ,the result will be 13 .so what is A 紧急!