Estimating Growth Scenarios

You're the Growth Manager at Glowly, a direct-to-consumer personal care brand. Launched three years ago, Glowly offers organic skincare products and has grown to $12 million in annual revenue with a strong online presence.

The brand faces cost efficiency issues and has prioritized improving its contribution margin by 100 basis points over the next quarter. A key lever in this is enhancing digital advertising efficiency.

How would you calculate the required improvement in digital advertising to meet this goal? How would you estimate its impact on customer growth targets?