Equation #1: quarter + quarter + quarter + quarter + quarter + quarter + nickel + penny = $1.56

Equation #2: dime + dime + dime + dime + dime + dime + dime + dime + dime + dime + quarter + quarter + penny + penny + penny + penny + penny + penny = $1.56

Equation #3: penny + penny + penny + penny + penny + nickel + dime + quarter + quarter + dime + dime + dime + nickel + nickel + nickel + nickel + quarter + penny + dime = $1.56

Equation #4: penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + penny + quarter + dime + nickel + quarter + dime + nickel + penny + quarter + nickel + nickel = $1.56