Cindy's grandfather opened a savings account for her when she was bom. He deposited one lump sum of money and never touched the account again. The
account had a 4% fixed simple interest rate. Cindy closed the account when
she tumed 18. At that time, the account had eamed $72 in interest. How much
did her grandfather originally deposit? (Use/prt)
O
A $100
B. $72.
C. $51.84
D. $40

the answer is (-4,-4)

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step-by-step explanation:

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the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.