It is an example of chemical change.
the answer is chemical change everybody knows that
The appearance of reddish-brown spots on a bread knife after washing and not drying is a result of a chemical change known as rusting. Rust, primarily iron oxide, forms when iron reacts with moisture and oxygen. This change is indicated by the formation of a new substance, differing in properties from the original material.
;
Jawaban:Jika menabung Rp10.000 setiap bulan, maka dalam satu bulan akan mendapatkan Rp10.000. Jika menabung Rp10.000 setiap hari, dalam satu bulan (asumsi 30 hari) akan mendapatkan Rp300.000. Penjelasan:more or less like this :)