Current location - Training Enrollment Network - Mathematics courses - The math club has a secret bookkeeping method. The income in 300 yuan is -200, and the income in the room is -300. How much was it when they used it to go to 50 yuan? What's the income in 400 yuan?
The math club has a secret bookkeeping method. The income in 300 yuan is -200, and the income in the room is -300. How much was it when they used it to go to 50 yuan? What's the income in 400 yuan?
Income recorded in 300 yuan as -200 can be considered as -200/300=-0.66666.
So what's the income in 400 yuan? It can be calculated: 400*-0.66666=-266.67.
Using 300 to record 400 can be considered as 400/300 = 1.333.