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Ron's class donated [tex]\( d \)[/tex] dollars to a local charity. Danny's class donated [tex]\( 21\% \)[/tex] more than Ron's class. Which expression shows the amount Danny's class donated in terms of the amount donated by Ron's class?

A. [tex]\( 1.21d \)[/tex]
B. [tex]\( 0.79d \)[/tex]
C. [tex]\( d + 0.79d \)[/tex]
D. [tex]\( d + 0.21 \)[/tex]


Sagot :

To determine the amount Danny's class donated in terms of the amount donated by Ron's class, let's follow these steps:

1. Let [tex]\( d \)[/tex] be the amount of money Ron's class donated.

2. Danny's class donated [tex]\( 21\% \)[/tex] more than Ron's class. To find what [tex]\( 21\% \)[/tex] of [tex]\( d \)[/tex] is, we write:
[tex]\[ 0.21d \][/tex]

3. To find the total donation by Danny's class, we add this amount to the original donation ([tex]\( d \)[/tex]). This would be:
[tex]\[ d + 0.21d \][/tex]

4. Simplify the expression by combining like terms:
[tex]\[ d + 0.21d = 1d + 0.21d = 1.21d \][/tex]

Therefore, the amount Danny's class donated in terms of the amount donated by Ron's class is [tex]\( 1.21d \)[/tex].

The correct answer is:
A. [tex]\( 1.21d \)[/tex]