If I am making 100k monthly, am single, how much did suppose to make sure am saving monthly

Since your income is irregular but averages about ₦100,000 per month, it is better to save a percentage of every sale rather than waiting until the end of the month.
For someone who is single and earning around ₦100,000 monthly, a practical target is:
20% savings = ₦20,000 monthly (minimum target)
30% savings = ₦30,000 monthly (good target if expenses allow)
Since you sell a ₦2,000 digital product
Treat every sale as if the money is already divided:
For each ₦2,000 sale:
Save ₦400 (20%) immediately.
Use the remaining ₦1,600 for business expenses and personal needs.
If you want to save aggressively:
Save ₦600 (30%) from each ₦2,000 sale.
Why this works
Your income is unpredictable:
Some days: ₦20,000
Some days: ₦5,000
Some days: ₦0
If you wait until month-end, you may spend everything and have nothing left to save. By saving from each sale, you “pay yourself first.”
Suggested plan for ₦100,000 monthly income
Purpose
Percentage
Amount
Savings/Investments
20–30%
₦20,000–₦30,000
Living Expenses
50–60%
₦50,000–₦60,000
Business Growth
10–20%
₦10,000–₦20,000
Emergency Buffer
10%
₦10,000
Where to save?
Given your previous interest in investments, you could:
Build an emergency fund first (3–6 months of expenses) in a Money Market Fund.
After that, split new savings between a Money Market Fund and an Equity Fund for long-term growth.
A useful habit: every time a customer pays you, immediately transfer the savings portion to a separate account or investment app before spending any of it. This removes the temptation to use it.
How much are your monthly living expenses currently—roughly ₦40k, ₦60k, ₦80k, or more? That will help determine whether 20%, 30%, or an even higher savings rate is realistic.