Can't plot a graph to show highest and lowest products

The plot below shows the highest and lowest selling products.

Product_Quantity_in_Portugal %>%
select(Quantity, Total_Sales)

group column by

select(Quantity, Total_Sales)

Sum the total no of sales using (Sum, average etc)

sunnarise (total=n ()) %>%
####creating a new variable in a new column using mutate
mutate(percent=total/sum(total)) %>%
arrange(desc(total)) %>%
ggplot(aes(x=Quantity, y=total)) +

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