QUESTION 4
ii
Easy
A telecom company charges ₹600 for a certain recharge scheme. This prepaid balance is reduced by ₹15 each day after recharge. After how many days will the balance run out?
SOLUTION
Let the remaining balance be \(0\), i,e., \(b(x) = 0\)
So using the balance equation, we get
\(600 − 15x = 0\)
⇒ \(15x = 600\)
⇒ \(x = 40\)
So using the balance equation, we get
\(600 − 15x = 0\)
⇒ \(15x = 600\)
⇒ \(x = 40\)
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Final Answer : The balance will run out after 40 days.
Concept Note
The relationship between the days and balance is perfectly linear, so we can find when the balance reaches zero using the balance equation.