Calculate the earnings of three workers A, B and C under Merrick’s plan of piece rate system, given the following:

Standard production: 120 units

Production of A: 90 units

Production of B: 100 units

Production of C: 130 units

Ordinary piece rate: Re 0.10

On the basis of the following information, calculate the earnings of A, B, C and D under Merrick’s differential piece rate system:

Standard production per hour: 12 units

Normal rate per hour: Re 0.60

In an 8 hour day:

A produced 64 units, B produced 96 units,

C produced 84 units and D produced 100 units

Hint: At 100% efficiency also, 110% of the ordinary piece rate applies.