How to correctly use if/else if?????? Please Help

Here is the assignment:
The current I drawn by an electrical appliance of power P watts from a supply voltage V volts is given by the formula: I = P/V amps. An electrical supplier stocks three types of cable, suitable for currents of up to 5 amps, 13 amps, and 30 amps, respectively. Write a program that asks the user for the power rating and supply voltage of an appliance, and displays the most suitable cable, or a warning if the appliance cannot be safely used with any of the cables in stock.
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I have everything set up to the best of my ability:

Code:

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
float P,V;
cout << "Enter the power rating of the appliance: " << endl;
cin >> P;
cout << "Enter the supply voltage of the appliance: " << endl;
cin >> V;

if (0 < P/V <= 5)
{
cout << "This current is suitable for the 5 amp cable" << endl;
}

else if (5 < P/V <= 13)
cout << "This current is suitable for the 13 amp cable" << endl;

else if (13 < P/V <= 30)
cout << "This current is suitable for the 30 amp cable" << endl;

else if (P/V > 30)
cout << "This current can not be safely used with any of the cables in stock" << endl;

return 0;
}

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But when I try using my program, I get the same answer for every current (That the 5 amp cable is appropriate):

Enter the power rating of the appliance:
90
Enter the supply voltage of the appliance:
2
This current is suitable for the 5 amp cable

How do I properly use if, else if so that my program runs correctly?

In C++ you can not check multiple conditions against a single value:

Code:

if (0 < P/V <= 5)

This should be

Code:

if(0 < (P/V) && (P/V) < = 5)

See this link for information on control statements.


Jim