1. (Hundred) analysis: "1+" is more than "1", and "1-" is less than "1".

2. Typical problem: Find how much one number is another (one percent) and how much more (less) one number is than another (one percent).

Knowing "1", find the fraction of a number (multiplication)

Find the fraction of the known unit "1" and find the unit "1" (division).

Problem solving formula

1, number of copies × number of copies = total

Total copies/number of copies = number of copies

Total copies/number of copies = number of copies

3. Speed × time = distance

Distance/speed = time

Distance/time = speed

4. Unit price × quantity = total price

Total price/unit price = quantity

Total price ÷ quantity = unit price

5. Work efficiency × working time = total workload.

Total amount of work ÷ work efficiency = working hours

Total workload ÷ working time = working efficiency

6. Appendix+Appendix = Total

Then subtract one addend = another addend.

7. Negative-negative = difference

Negative difference = negative

Difference+Minus = Minus

8. Factor × factor = product

Product ÷ One factor = another factor

9. Dividend bonus = quotient

Dividend = divisor

Quotient × Divider = Divider

10. Interest = principal × interest rate× time.

After-tax interest = principal × interest rate × time ×( 1- interest tax)

I gave you the formula to solve the problem. You can solve it yourself. Don't be lazy.