Write an expression in words that describes the relationship between the number of quarts and the number of cups

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Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?