The first step would be to find out what the operator between the two numbers is: is it plus, minus, times, divided by or something else. The best method depends on the answer to that question.
You might be able to find a RD 400 from a motorcycle dealership. The best bet of finding one of these bikes is too find a private seller and buy it from them.
The Scientific Method is a method made by science
400
Your lowest latency is going to be with a Firewire audio interface. The best Firewire interface with a guitar input is the RME Fireface 400.
Sony manufactures some of the best DVD duplicators. You can find them online at Amazon and in electronics retailers such as Best Buy. They range $250 - $400 apiece.
95% of 400 is 380.
150% * 400 = 600
Multiply 0.1 by 400 to get 40. This is how you find 10% of 400 without using proportion.
40 x 10 = 400
To find 0.1 of 400, you multiply 400 by 0.1. This calculation results in 40. Therefore, 0.1 of 400 is 40.
1 dollar or less if you can find one. Otherwise 100-400 USD
0.0004% Solution method: 400 / 100,000,000 = 0.000004 0.000004 * 100 = 0.0004% (multiple decimal values to get % values)