To determine the salary for next year, we can break the problem into two parts: calculating this year's salary after a 15% increase, and then calculating next year's salary after a 30% increase on this year's salary.

1. Calculate this year's salary:

   Last year's salary was $\$100,000$.

   This year's salary after a 15% increase: $\text{This year's salary} = 100,000 + (0.15 \times 100,000) = 100,000 \times (1 + 0.15) = 100,000 \times 1.15 = 115,000$

2. Calculate next year's salary:

   This year's salary is $\$115,000$.

   Next year's salary after a 30% increase: $\text{Next year's salary} = 115,000 + (0.30 \times 115,000) = 115,000 \times (1 + 0.30) = 115,000 \times 1.30 = 149,500$

Therefore, next year's salary will be $\$149,500$.

Would you like more details or have any questions?

Here are 8 relative questions that expand on this information:

1. How do you calculate a percentage increase?
2. What is the formula for compound interest?
3. How would the salary change if the increase next year was only 20% instead of 30%?
4. What if the salary increased by 10% each year for the next two years?
5. How do you calculate a percentage decrease?
6. What are some real-world examples where percentage increase is used?
7. How does understanding percentages help in financial planning?
8. What is the effect of compounding multiple percentage increases over several years?

Tip: Always double-check your calculations, especially when working with percentages, to avoid errors.