
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
$\textbf{Maria's Recent Collection}$

Maria collects stamps and organizes them by country and by the decade in which they were issued. She bought the stamps at different prices: Germany and Italy, $8$ cents each, Sweden $5$ cents each, and Norway $7$ cents each. (Germany and Italy are European countries and Sweden and Norway are in Scandinavia.) In her collection, the following counts of stamps from the 60s, 70s, and 80s are recorded:
- Germany: $60$s: $5$, $70$s: $10$, $80$s: $8$
- Italy: $60$s: $6$, $70$s: $12$, $80$s: $9$
- Sweden: $60$s: $7$, $70$s: $8$, $80$s: $15$
- Norway: $60$s: $4$, $70$s: $6$, $80$s: $10$

She gets a $10\%$ discount on any country's stamps if more than $15$ stamps from that country from before the 80s are purchased. Calculate the cost of her European stamps issued before the $80\text{'s}$.

Present the answer in LaTex format: \boxed{Your answer}
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