Algebra · real student question

Solve 295 = x + 0.0152 x (x x 0.0152)/(1 - 0.0152).

Question

Solve 295=x+0.0152x0.015210.0152295 = x + 0.0152\cdot\frac{x\cdot 0.0152}{1-0.0152} for xx.

Step-by-step solution

  1. Simplify the denominator. 10.0152=0.98481-0.0152 = 0.9848, so the equation reads 295=x+0.01520.0152x0.9848.295 = x + 0.0152\cdot\frac{0.0152x}{0.9848}.

  2. Multiply the two percentage factors. Both 0.01520.0152 factors multiply together: 0.0152×0.0152=0.00023104.0.0152 \times 0.0152 = 0.00023104. This is the crucial observation - a 1.52%1.52\% rate applied twice is not 3.04%3.04\% but roughly 0.023%0.023\%.

  3. Form the single coefficient of x. 0.000231040.9848=0.000234606\frac{0.00023104}{0.9848} = 0.000234606\ldots so the equation collapses to 295=x+0.000234606x.295 = x + 0.000234606\,x.

  4. Factor out x and divide. 295=x(1+0.000234606)=1.000234606xx=2951.000234606294.9308.295 = x\,(1+0.000234606) = 1.000234606\,x \Longrightarrow x = \frac{295}{1.000234606} \approx 294.9308.

  5. Verify by substitution. 294.9308+0.01520.0152×294.93080.9848=294.9308+0.0692=295.0000294.9308 + 0.0152\cdot\dfrac{0.0152\times294.9308}{0.9848} = 294.9308+0.0692 = 295.0000, so the root is correct.

  6. Reject the commonly quoted value 111.241. Substituting x=111.241x=111.241 gives 111.241+0.0261=111.267295111.241+0.0261 = 111.267 \neq 295, so that number does not solve this equation - it presumably belongs to a differently structured formula. Because the added term is only about 0.023%0.023\% of xx, any correct answer must sit just below 295295.

Answer

x=2951+0.015220.9848294.9308x = \frac{295}{1+\frac{0.0152^2}{0.9848}} \approx 294.9308

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