Based on the current quarterly premium and the and the amount it increased by, the previous premium was $99.55.
The premium was a certain figure and when this figure was increased by $65.80, it went to $165.35.
The equation is:
165.35 = x + 65.80
Solving for x would give:
165.35 = x + 65.80
x = 165.35 - 65.80
= $99.55
The previous premium was therefore $99.55.
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