Activity 15: Writing Arithmetic Expressions    Write a valid arithmetic expression which represents the following statements.  Write your answer on the blank provided 20% of the sum of cost1 and cost2.     2. The triple of number.      3. The sum of deduction1, deduction2, and deduction3.      4. Deduct 5% of price from price.      5. Average of grade1, grade2, grade3, and grade4.

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