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To solve this, you have to start with the whole of 80, and then take away 95% of 80, or (.95 x 80).

80 - (.95) x 80 = 4

Alternatively, you could do a bit of quick mental algebra to speed it up:

80 - (.95)(80)

= 1 x 80 - .95 x 80

= 80(1 - .95)

= 80(.05) = 4

Since you take away 95%, you're left with 5%.

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13y ago

What else can I help you with?