Answer :
Her mental age would be 8 yrs old.
IQ [ Intelligent Quotient ] is a type of standard score that indicates how far above, or how far below, his/her peer group an individual stands in mental ability.
IQ of a person is given by the formula -
IQ = MA/CA * 100
IQ = Mental Age / Chronological Age * 100
According to the question, IQ = 100, CA = 8
⇒ 100 = MA / 8 *100
⇒1 = MA / 8
⇒ MA = 8 Yrs
Hence, the estimated mental age of susan is 8 yrs old.
To understand more about Division and Multiplication refer -
https://brainly.com/question/28768606
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