Investing in Kruger coins through FNB

Q: FNB offer a service where one can invest in Kruger Rand gold coins through them. They then store it for you at a fee of 0.86%pa.

-If one wants to sell the coin back to them, its done at the click of a button.
-If one wants the physical coin, they can arrange for it to be delivered to you at a cost.
-Prior to requesting the coin, I'm not sure if they keep the physical coin or not.

Please advise if it will be permissible to purchase a coin through them in this manner.

Meaning of the verse that Allah Ta'ala alone has complete knowledge of five things

Q: It is mentioned in the Quraan that there are five things which only Allah Ta'ala knows. The first is regarding when Qiyaamah will occur, the second is regarding when rain will fall, the third is regarding what is in a woman's womb, the fourth is regarding what a person will earn, and the last is regarding a person's time of death.

Nowadays, we can say when rain will fall by referring to weather forecasts. We can say whether a boy or girl is in the mother's womb by ultrasound. So when we have information regarding these things, then what does it mean when the Quraan says that only Allah Ta'ala has knowledge of these things?

Renting out a portion of a property in exchange of a service

Q: There is space for 4 tenants on a property. Is it permissible to rent out portion A of the property to a garden company, with the rental due being a service, e.g. the tenant of the area A will tend to the initial landscaping and then gardening of the entire property long term, as long as they occupy the area A as a tenant.

There will be no rental payments due apart from the gardening service they will offer. In essence, is ijaarah permissible in exchange of a service rather than money?