The answer and the work

Step-by-step explanation:

Let's let represent the cost of tapes, and be the cost of CDs.

From the problem statement, we can create the following two equations:

To solve this system of equations, we can solve for in the second equation and substitute into the first equation to get the value of :

Substitution:

Now that we know the cost of the tapes, we can plug this value into either equation to get the cost of CDs:

or

Therefore, the cost of a tape is and the cost of a CD is .

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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