THE WHOLE TOOLKIT

Good tools. One place. — Page 31

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Math & statistics

Dilution final concentration: Final concentration = starting concentration times starting volume divided by final total volume.

Home & construction

Paint can coverage cost comparison: Extra cost per area of Paint A versus B = price A divided by coverage A minus price B divided by coverage B.

Home & construction

Garden soil bag quantity and cost: Total bag cost = rounded-up bags for area times depth with buffer, multiplied by bag price.

Everyday arithmetic

Pet food daily feeding cost: Daily cost = bag price divided by bag weight times daily amount with waste allowance.

Everyday arithmetic

Event cost per attending guest: Cost per expected attendee = fixed costs plus variable cost for expected attendees, divided by expected attendees.

Everyday arithmetic

Catering servings with buffer: Trays required = guests times servings per guest with buffer, divided by servings per tray, rounded up.

Everyday arithmetic

Laundry cost per load: Total cost per load = detergent, electricity, water and machine cost allocations.

Everyday arithmetic

Reusable bottle refill break-even: Break-even refills = reusable bottle cost divided by saving per refill, rounded up.

Everyday arithmetic

Printing cost per page: Cost per printed page = cartridge cost divided by yield plus paper cost divided by pages per sheet and maintenance.

Everyday arithmetic

Grocery delivery true cost: Added delivery cost = basket markup, service and delivery fees plus tip, less avoided travel cost.

Business & selling

Charity event net funds raised: Net funds raised = ticket, donation and sponsorship revenue less event costs and fees.