Would you save your money in an investment plan (projected interest rate at ~7-10%) or save it in the bank (interest rate at 0.05%) or save it in a savings plan (interest rate at 3%)?

Might want to split between these 2 plans first (for starters)

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High-interest Savings Plan (note income source might be required) : Generally hgih 2+ ~ 3+% pa.

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Singapore Savings Bonds (10 years tenure, 6 months payout interval) : Avg 3.3% pa interest (based off Oct 2023 issue)

7-10 % interest is very high. Please check what is the company doing with your money. The last thing you would want is for you to not get back your principal in full.

7-10% sounds high. Ask what is the risk of the investment plan. 7-10% might be the optimistic case. Check the downside

I would rather put it in Singapore Saving Bond.