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The problem is asking for the number of products (denoted by \( x \)) that need to be sold to obtain a profit of Rp 100,000, using the given function \( f(x) = 4x + 8 \), where \( f(x) \) represents the profit in thousands of Rupiah.

### Step-by-step solution:

1. **Given function:**
   \[
   f(x) = 4x + 8
   \]
   Here, \( x \) is the number of products sold, and \( f(x) \) is the profit in thousands of Rupiah.

2. **

A businessman has a formula to calculate daily profit from his products, f(x) = 4x + 8, where x is the number of products sold and f(x) is the profit in thousands of rupiah. One day, the businessman wants to know how many products need to be sold to achieve a profit of Rp 100,000. Determine the number of products that must be sold using the inverse function!

This problem involves using an inverse function to calculate how many products need to be sold to achieve a profit of Rp 100,000, based on the formula f(x) = 4x + 8. Learn step-by-step how to solve this algebraic problem, suitable for high school students.

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