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The total amount of money he had is $160.
The unitary method is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.
Given :
I had $13.00.
My Mom gave me $10.00.
My Dad gave me $30.00.
My Aunt, My Uncle, and grandma gave me $100.00.
I had another $7.00.
The initial amount of money he had
= $13 + $7
= $20
His Mom gave him $10.00.
So, the total amount of money now he had is:
= $20 + $10
= $30
His Dad gave him $30.00.
So, the total amount of money now he had
= $30 + $30
= $60
So, the total amount of money now he had
= $60 + $100
= $160
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