Image forming apparatus and computer-readable storage medium

A non-transitory computer readable storage medium storing computer readable instructions that are executable by a computer in an image forming apparatus, the image forming apparatus comprising a recorder connected with a container configured to store a colorant, a display, an input interface, and a memory, the computer readable instructions, when executed by the computer, causing the computer to:

• control the recorder to consume the colorant to print images on sheets;
• count a consumption value reflecting an amount of the colorant consumed by the recorder and a quantity of the sheets used to print the images;
• determine an average usage value reflecting the consumption value and the quantity of the sheets;
• obtain a filled amount value indicating an amount of the colorant filled in the container and determine a first printable quantity reflecting the obtained filled amount value, the counted consumption value, and a standard usage value stored in the memory;
• determine a second printable quantity reflecting the filled amount value, the consumption value, and the average usage value;
• control the display to display a first screen including a first object in a first screen in the display, the first object indicating the first printable quantity;
• control the display to display a second screen including a second object in the display, the second object indicating the second printable quantity;
• and
• control the display to display a screen including a third object, through which one of the first object and the second object to be displayed in the display is selectable.