Equity Holistic Ltd. spends $1200, $1400, $800, and $1700 on average on replacing printer cartridges for its black & white inkjet printers, colour inkjet printers, black & white laser printers, and colour laser printers, respectively, every month.

a. What percent of the total expenditure on printer cartridges does it spend on colour laser printers every month?

b. If it decides to reduce the expense on both colour inkjet printers and colour laser printers by 50%, what percent of the total expenditure would it spend on black & white laser printers?

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