Write down an equation that Abel can use to calculate the total cost (in rands) per single trip, in the form: Total cost (in rands) per single trip \( =\mathrm{R} 50 \) + (number of \( \mathrm{km}-3 \mathrm{~km}) x \) R15

Did you know that calculating costs per trip has historical roots in trade practices? Merchants in ancient marketplaces would often weigh goods and adjust prices based on distance traveled, similar to how Abel is figuring out his travel costs. This method not only ensured fair pricing but also helped in efficient resource management—something that’s still relevant in today’s economy! In the real world, this equation can be quite practical! For instance, if Abel travels to various locations, he can adjust the "number of km" in his formula to get an accurate total cost. This equation helps him budget wisely before embarking on his journey, making it easier to plan expenses whether it's for work, leisure, or visiting friends!