## How to Calculate and Solve for Rate | Salt Trace Method | Water Budget

The image above represents rate.

To compute for rate, three essential parameters are needed and these parameters are Rate of injection for salt solution (q), Concentration of salt solution (c1) and Concentration of river downstream (c2).

The formula for calculating rate:

Q = q(c1 – c2)

Where:

Q = Rate
q = Rate of Injection for Salt Solution or Trace
c1 = Concentration of Salt Solution or Trace
c2 = Concentration of River Downstream

Let’s solve an example;
Find the rate when the rate of injection for salt solution is 12, the concentration of salt solution is 20 and the concentration of river downstream is 18.

This implies that;

q = Rate of Injection for Salt Solution or Trace = 12
c1 = Concentration of Salt Solution or Trace = 20
c2 = Concentration of River Downstream = 18

Q = q(c1 – c2)
Q = 12(20 – 18)
Q = 12(2)
Q = 24

Therefore, the rate is 24.

Calculating the Rate of Injection for Salt Solution when the Rate, the Concentration of Salt Solution and the Concentration of River Downstream is Given.

q = Q / (c1 – c2)

Where;

q = Rate of Injection for Salt Solution or Trace
Q = Rate
c1 = Concentration of Salt Solution or Trace
c2 = Concentration of River Downstream

Let’s solve an example;
Find the rate of injection for salt solution when the rate is 40, the concentration of salt solution is 32 and the concentration of river downstream is 14.

This implies that;

Q = Rate = 40
c1 = Concentration of Salt Solution or Trace = 32
c2 = Concentration of River Downstream = 14

q = Q / (c1 – c2)
q = 40 / (32 – 14)
q = 40 / 18
q = 2.2

Therefore, the rate of injection for salt solution is 2.2.

## Calculating Compound Interest Using Nickzom Calculator

Using the Nickzom Calculator for Math calculations is quite simple. Navigation through any of the App platforms from Mobile to Web is quite easy. Just a bit of playing around and you’re quite comfortable with the user interface. Does Math seem hard, Nickzom Calculator makes it easier.

We will consider Compound Interest, how your Principal, Interest and Amount can easily be calculated using the Nickzom calculator. The platform  also goes a long way in showing the formula used, and the steps it took to arrive at its answer.

Compound Interest

Compound Interest being a very popular topic in Mathematics entails basically  Principal, Rate, Interest, Time (number of years) and expected amount. The Nickzom Calculator can carry out calculations on Compound Interest, solving problems on

# What is Simple Interest?

Simple interest is a method of calculating the interest charge on a loan or bill. Simple interest is determined by multiplying the interest rate by the principal by time which is normally in years (per annual) but could be in months, days, weeks etc during the specified time frame.

Simple Interest (S.I.) = (P x r x t) / 100

Where P stands for Principal, r stands for interest rate and t stands for time.

## How to Solve and Apply Simple Interest.

There are a number of different reasons that could make one want to carry out a simple interest operation. One of them being that you want to lend money to your friend to start a business and you want your money to work for you and reproduce during the course of the loan.